Carver Owners Forum

Thanks guys.

I believe we all know GM makes these engines. GM has required Mobil 1 (for warranty) on all of its high performance roller V8 motors since 1992 I believe. Mercedes Benz, also requires mobile 1 as I believe BMW also does. They all only require 12 -15k mile changes.
I have personally disassembled 2 motors with over a 100k miles on mobile 1 and found zero sludge build up. In my younger years I disassembled many motors with half the mileage that were so full of sludge you had no question why they failed. (not rottella as far as I know)
That being said, in most of our marine applications, the oil is changed long before its life is anywhere near its end, so I personally believe its more of a personal choice.
I am not knocking rottella, as I know of no negatives. I am just a fan of full synthetics, and know an R&D enginner from XOM that has show me bullet proof evidence the stuff does not break down.

I don't know how old is your gas I would carry 4 fuel filters and gas to fill filter with the wrench to take fuel filter off.
I guess you have Sea Tow or Boat US I would not travel without it.

Tom to each his own. Personally can't see the added expense for oil only used for around 6 months and may be 50-100 hours a year. Our Crusaders are stickered for 40W on the fill caps. Had synthetic put in our Harley after the break in period and had it removed on the next oil change. I could hear a lot more engine and tranny clatter with the synthetic oil in the crank cases. I to have torn down engines, just did a pair of 1986 5.7l Crusaders in 2014 with 1200 hours on them and I got to tell you they were pretty clean and I didn't notice a lot of residue any where in these engines. Guess it's all a personal preference. And even though it's the norm these days and the newer engines call for it, I was never a big fan of multi viscosity oils. Guess I'm from the straight weight generation is all!

I run Brad Penn 20-50 per engine rebuilders requirement for warranty. It has a high zinc content. Not sure that is needed for a newer 8.1L. Seems to work good in my 7.4’s. I know all my friends use rotella and seem to like it. Easier and cheaper to get that’s for sure.

Heres an oldy...anyone remember the green coloured kendall gt1 40wt oil....now if I could find that now....ahh the good old days........

Bud, that was back when oil was oil. Not a mix of recycled and new oil sold as new oil! MT what does the Brad Penn run a quart? 3-5 Times the cost of Rotella I'll bet! But I do understand the warranty issue.

The Brad Penn is only sold by the case where I buy it, for $65 a case (12). Not to bad of a price. The oil is green, never seen such a thing until I started using it 2 years ago!

MT, that's not bad at all for racing oil, matter of fact the cheapest racing oil I've seen when I was looking for a high zinc oil after rebuilding a couple of 5.7's. Think at that time the best I could find was around $120.00 a case.

http://gmauthority.com/blog/2017/12/mob ... oil-video/

Kind of interesting video about oil.