I agree about not heating your motor oil / oil pan up on boat apps especially if it is over 60 degrees before start ups. Heck I know here even an unstarted boat - the engine compartments can be 120 - 125 in the dead summer just sitting. I know because I about die with the heat stuck in them for 12 hours perday in the summer. A freakin hot box.

Not to start a debate here but years ago there was story out about prelubing engines before start up. Long story short was a guy who was a hot rod car collector with a bunch of expensive cars that would sit for long periods of time in his collection. Kind of a collector gearhead like Jay Leno worth large sums of money.

Actually Jay Leno is very knowledgeable about gearhead stuff. Anyways the guy had money so he had some independent testing done by a credited car care testing company on a # of his cars for dry start up wear vs testing different prelubers on the markets and techniques. The story was written about that and then included boats because they sit as well but a lot different environment (worse) because some sit in the water for years and so on. Anyways they reported the testing results from the independent company in which turned out very favorable for some prelubers and or pre lubing techniques of the engine

I will try to find the #' s of how much in favor the prelubing did vs dry startup vs months vs days of sitting and they did hours as well. It was years ago and I had a copy in print form of it. Actually it was a very good story and the info. Some basic info but some really good tech info and numbers. Anyways just passing that on.

MT - I wasn't apecific enough with crossovers.

There are few applications where they are needed, or should I say, used more succesfully. Most start with the letters B L O W E R S. Lol.

And wasn't specific about water Psi problems because again that;s another topic. But, the water psi problems are usually on boats that are driven with outdrives that start with B R A V O.

Anyway, more problems ae caused by crossovers for 2 reasons: Purchaser buys them for bling and has no idea what it effects and 2 most performance people have 450-550 hp N/A big blocks.

Ive got about close to two dozen blown bbc marine engines in my area running crossovers, and no water thermostats running 20w50 oil including my engines in cold lake michigan.

My water pressure at full throttle is 18psi. Hardly a problem. My oil reaches operating temp with the oil thermostat but does take a bit to warm up.

Nobody is spinning bearings, or greneding engines, or anything like that due to oil temps or oil grade. Years back i never had oil thermostats. My oil temp was always cold. Never even got to 170 on a hard run. Tore engines down after they had several seasons on them making around 625hp back then. The bearings could have been put right back in as they looked great, the rockers , pushrods, valve stems, and generally everything in the inside of the engine looked great.

I do not suggest running the oil that cold, and generally i agree with what you are saying borgie. You are here to defunk myths about how oils work and i agree with just about all the data you provide here. What i dont agree with is your opinions on what theoretically will happen if you run xxx oil and xxx temp and what really happens in the field.

Ive seen a few engines with extremely high water pressure with stock merc water pump setups as well. Simply having a transom pickup mounted too deep can be a source of excessive water pressure.

Ha, ha, ha.

The site is still f*ked up. I responded to MT's last reply before his posted.

Man am I fast. My computers oil cooled ECu must have some Slick 50 and Prolong mixed in.

BUP- It would be great to see the data. Pre lubers sound like a good idea and the companies literature makes it sound like you must be a moron if you choose to run without it, however just like bypass filtration there just doesn't seem to be a lot of conclusive proof. There is data, it's just minuscule from what I've seen.

The other thing that I'm curious about is oil type used. As you know some oils have very high polarity, thus the cling of oil left on engine parts protects during those times when oil flow is slow/interrupted, ie start up.

MILD- So you are saying that nobody has ever spun a bearing when leaning on a cold engine? I can tell you for a fact that I've seen marinized Rolls Royce V-12's have this issue with my own eyes. These engine make a build BBC look like a toy. Is it common, certainly not, but it "can" happen. These days let's face it, oil related failures are "almost" never seen due to the advancements in lubrication technology. BTW, dig the avatar!

I hear you on the bravo thing with water pressure but trust me ive seen my share of TRS and SSM boats with high water pressure. Offshore style transom mounted pickups can scoop extreme amounts of water
.

i agree crossovers are of no benefit on most engines.

What I see with too cold of oil is: lot of fuel dilution and some water dilution.

(t's no good I tell you. I can usually tell by the lifters clacking which then makes me check and smell the oil.

My nose is good. I can smell fuel and tell if fresh or not. I can smell oil and tell if fuel diluted, and more impoortantly, I can smell a beautiful female form from miles away.

He, he.

the story said the reason the guy did and paid up the azz for the testing was because he could not get any sound info nor any other true test results so he said the heck with it. I will have my own testing done. The story said it took about 6 months for him to find a company that would do the testing how he wanted done with his cars. He did not care about the costs. I think the testing timeframe was 6 months as well. I think he really wanted 100% carved in stone answers & results, not hear say nor peoples opinions. The funny thing is It was sent to me from a boat engine manu or some boat related company. It was years ago. I know I did not throw out but it most likely stored in my boat library of congress.

No, I am just saying, that I have not seen any of the engines I mentioned spin bearings from using a 20w50. Matter of fact, thats kinda what started our little tiff we had here on this thread. You mentioned several times that guys on oso think they need 50 grade oil, and listed the negatives about 50 grade oil, how it has no business in most of the engines on oso, and so forth. All I simply stated, was that there are many of us, running some grade of 50, whether it be 15w50, 20w50, and had good results with it. Thats all. Wasnt trying to argue you're knowledge of engine oils.

Still waiting on some responses from Mobil, Pennzoil, Brad Penn, Amsoil, Redline, and Gibbs on the oil recommendation for my marine 650HP offshore engine. I used 650HP since you stated my engines arent the norm on oso.

So far, Gibbs was the first to respond with wanting to know the rod and main clearances, which I replied back with .0025-.0027 on the rods, and .0027-003 on the mains. Curious to see what they come back with. I am all for learning new things and trying new products

Driven (Gibbs) is going to tell you to use this if they 4 sure know its a boat app. Do you know the persons name that replied back to you from their email ? Especially if it was Lake Speed Jr. or they are most likely asking him.

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

I sell it and use it as well.