Hydrocruiser said:

Hydrocruiser also said:

Hey, aren't those "diesel oils"?

Oh quit it with the "Hydro said stuff"....

Oils labeled "diesel" have harsher detergents for soot and carbon control... like magnesium and silicon. They are also high in ZDDP for anti-wear... They are the only choices for a diesel for sure...some feel good for any iron block rig...but they can be hard on aluminum parts and not for use in aluminum block engines so say the gurus. So not for your family vehicle...but marine use? Looking good after looking into it more...

They are probably the best of the lower priced oils. Rotella goes for 6 bucks at Home Depot in 5 qt plastic containers. With a $2.99 A/C filter it's the best value out there if you want to pay less...and some do.

Not to worry my synthetic friends....you guys have much tougher film strength and outperform all those other guys..

Yawwnn...

I forgot...and I am sincere...what is your take on what is best to use?

Hey Hydrocruiser, I'd like you to ask your "gurus" if they've ever heard of the Duramax diesel... Lot's of aluminum in that. Ask them to go to Bob's site and look at the UOA's on Duramax and Cummins diesels running conventional 15w40 HDEO's. Virtually no aluminum showing up in the oil. Where's that evidence of being "hard on parts"? My Cummins has aluminum pistons. And 215,000 miles. UOA's show almost no aluminum wear.


Jim

Ok, here's my humble opinion:

On extended drains in boats: synthetic 15w40 or 15w50 or 20w50

On 20 hour changes in boats: Kendall 20w50, any HDEO or Merc 25w40

In my wife's E430: Mobil 1 0w40 & 13k oil changes

Cummins: 15w40 HDEO anything

Everything else: HDEO 15W40 (Includes Trooper, Miata, Tracker, 1966 Massey Diesel)

Sounds fine...how many hours would you extend out to with a synthetic in a boat?

..and your wife has a great car...how do you like Benz's new 430 engine? I see a lot of S430 models out there as well...it's a six cylinder that has a good amount of HP and torque? Seems to be selling better than E500 or S500 models. Benz also wants a lot more $ for the 500 engine.

In a hi perf BBC, I'd never go beyond 20 hours. That's why I don't use synthetics. I'd run synthetics out to 50 hours or so in a conventional (cruiser-style) engine, I guess. But I've had such good performance out of dino oils, that I use them to 50 hours in my Donzi's 351w and my old Trojan's 318 Chrysler. Never had an oil related issue.

The 430 is a V8.

Jim

You are very good at matching a specific product to a particular service requeirement and drain interval. The results you describe match that.

Oh the 430 is a V-8...I heard it is a smooth running high tech machine too

How about a lineup in suggested recommended order of Drive Oils/Gear Lubes?

Lot's of great reading here, Thanks
I was already a BIG fan of Mobil 1 Syn oils. 95 Yukon with 185K miles all on Mobil 1 10w30 and the Z06 gets 5w30. Previous boat had Mobil 1 as well.