So Mobil 1 tells this guy, 15w50 is ok to use in summer time in nee jersey, but in winter time, recommends 0w40 or 10w40 due to the cold winter temps there. Makes sense to me. If 15w50 is acceptable in a overhead cam bimmer in the summer, should be just fine in my old loose pushrod blown big blocks.

http://www.mobiloil.com/USA-English/...in_Winter.aspx

and and and do not forget I have Mystik 15w 50 JT8 syn blend motor oil and their gear lubes in about 250 marine apps going into my third year of using it and selling it. just messin here but NO BS about the 250 marine apps.

Here is a good friend of mine who does this stuff for a living maybe I can get him to come up here for some good education. www.dysonanalysis.com Scroll down and click on & listen to his bio off of the youtube video.

Actually about 15 of us all pitched in opinions to help start Bob is the oil guy website about 15 years ago. The guy who started it, Bob Winters lived in Florida and was a large Schaffers Oil wholesaler & retailer to a lot of the dirt track crowd around the South East.

bob is the oil guy website back in the hay day really had 3 main people on the site that really knew their stuff. They were - Terry D. who owns Dyson Analysis, the screen name guy called Molcure (spelling) and Bob himself plus some guys from NORIA. All of them are long gone from that site. See Noria was the site to be on at first, it was filled with THE EXPERTS but later on it got over ran by the public so hence Bob is the oil guy started by Bob Winters

Some real info for the guys on bob is the oil guy website, it is not even close to what it was in years past for expert information.

Yes I'm familiar with terry, and I disagree on bobs knowledge, however the others you noted I can concur. I post 1 link to bobistheoilguy and now that's where I get my information... Not true. I'm glad 50wt is working out for you. Again, what does this prove BUP?! Has absolutely nothing to do with my point if that's your intent.
Mystic has a great reputation, I will give you that.

A fact still remains, if you are running a shear stable oil a 0w/5w/10 40wt in a BBC will work better at startup than a 15w-50 20w-50 etc. The 50wt is overkill, and actually with use maybe the reason it seems to be ok is that it loses viscosity with use.. ie that 50wt oil becomes a 40wt after it's been in use. However UOA's would be the only way to show if this is happening. Just because the given oil has tons of VII doesn't mean its necessarily being sheared with a given engine design as you are likely aware. I am not refuting that a 50wt can and does "WORK" in a BBC marine endurance application.

Also, not taking away from Terry's knowledgd base, he's a smart guy, however he like many of us has a vested interest in a lubricant company, of which I won't list. Just food for thought.

I know you perform UOA's, however have you done any tear downs of these motors utilizing JT-8? Would be very interesting if you do. Thanks

One more thing, in the high horsepower applications you are running, what are your oil temps?

I will agree with you about Bob Winters his own indepth but to further explain what I met was he posted info that was good info to learn from especially for a person to learn behind a computer. You said you had sources for your depth and listed bitog site. I didn't. So what are your sources ?

next NORIA was the expert site to get info from not BITOG site.

How do you know Terry D ? He is a lot smarter than you think he is about this stuff. He has done a lot of work for me in the past and was spot on with his results and indepth.

Next for your info Citgo always owned Mystik and they Citgo intro Mystik way back on Oct 1 2003, It has been around. They do have an almost full marine specific line to the retail consumer that has been out for 3 or 4 or 5 years now.

I am not discrediting you as I can see some of your stuff holds good value and really good info but I am not no misinformed nor medium educated person when it comes to full circle about boats. I am so overly trained and by most of the OEM's in this that I can pat myself on the back - not bragging but it is what it is. I do way more than just post up here about boats and work on boats for living.

Last, I have no intent against you - where did that come from. I posted really for everyone not to get caught up with the bitog website about info.

Have a question for you. What are you current cruise vs WOT oil temps?

This is just an example of why I ask. I think people forget that most marine applications with a properly specd oil cooler run low oil temps vs many other applications such as circle track, road racing etc. Obviously we have unlimited cooling capabilities in contrast to these other engines, and even if you run a 160-180 oil thermoatat, that's not considered high oil temperature by any stretch..

http://www.drivenracingoil.com/news/...des/viscosity/

Oh trust me, I know you are a talented guy. I've heard about your quality of work and knowledge beyond OSO. Terry is also a very intelligent/honest guy for sure, never said otherwise. Regarding my sources, again I like a certain level of privacy regarding those sources. I don't like to disclose what I do for a living. I actually have two jobs. Boating is just a hobby that I enjoy with my free time.

I have never met terry face to face, however I have used his oil analysis services with several projects in the past. He is very passionate about lubrication technology and his company is one of the best IMO. The other fellow you mentioned from Bobis, was molekule. If I recall he is a tribologist and for a time blended his own motor oil, ATF among other things. Bright guy indeed.

For some reason I had it in my head that mystic sold to Citgo. My mistake. Just like anyone else, I'm not perfect ;)

You somewhat discredit Driven oil before as I use it and their marine recommendation is 20w - 50. I do take all the seminars that Lake Speed Jr teaches about oils and of course Driven oils. He is not slamming Driven down your throat as you would think.

Anyways I re read 2 of your posts but really did not read any other of them. Terry only really has recommended about 6 oil / oil related products over the years. I know who you are talking about with the Bio Based oil company. See I really know whats going on around this field as well. He also use to recommend Redline oil but I did some testing actually a lot testing with him using Redline motor oil 5w-20 back around 2005 thru 2007 years in new Ford Triton apps.

I still have all my reports using & Testing Redline and a whole freakin book of many others. Also Back years ago I did a lot of gear lube and motor oil testing for a race boat that I was prepping / the 500 EFI engine. If you ever talk to Terry ask him about it because I over loaded him with oil samples. Some funny stories back then. I did not know you knew him - we use to met up at the NHRA drag races years ago.

Bingo with the MOLEKULE, I know you know as you did pick out the right guys info to follow. He (Molekule) and Terry did reports and testing results for me with a bunch of marine gear lubes, I sent them back in the early 2000's. Virgin and used samples.

They both gave me info straight across the results about Merc High Performance gear oil "NOT IMPRESSIVE AT ALL" and "HOW MUCH DO PAY FOR THIS OIL" they about fell over when I told them the price.

Also back then everyone thought it was synthetic based gear oil and many dealers proclaimed it was when selling it, even the Merc reps when they talked to you about it used the word synthetic ( way back then) I really think they did not know but thought they did. It is not and still is not a synthetic marine gear lube.

And Yes Molekule did Blend his own oil and it was more than ATF - people bought his products fast that he could not keep up. Also do remember German Castrol Motor oil. It was shipped from Germany to the USA and only Auto Zone sold it. They all went nuts for it, buying it all up across America. Do you remember that one ? They also called it GC and really did not want many others including outsiders to find out about it.

I will get back to you about the other questions. I was just having some fun about the past when a lot people made all of this stuff fun and informative - you just had to know who to follow and get ahold of when needed. Sorry for the off the wall posts.

My oil cruises at 180-190. At wide open throttle, its 200-210 range.

That is a good article you posted there. The only thing I did not see mentioned, was "marine" or "offshore racing". The mentioned NHRA, Nascar, and world of outlaws.

I think a key difference here, is that none of the engines in those applications, are meant to have 25+ hour oil change intervals and 300-1000 hour teardown intervals. I went on their website to see what oil they recommend for ''offshore marine" high performance engines, and this was the only oil listed , well this one, and another 15w50 "break in oil".

http://www.drivenracingoil.com/dro/m...motor-oilhtml/