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-   -   Here we go, THE OIL QUESTION (https://www.offshoreonly.com/forums/general-q/386570-here-we-go-oil-question.html)

Tartilla 10-02-2025 12:57 PM
Originally Posted by underpsi68 (Post 4935722)
Crower recommended not to run synthetic with their hi po solid rollers. I have been running Driven semi synthetic.
I like to see confirmed reasoning why a company would not recommend a certain oil. Maybe they did.

Roller lifters on a roller lobe have tangential contact. Meaning very low surface area. High spring rates, with slippery oil that has the film strength taper off as the load increases, would be a bad day out.

Tartilla 10-02-2025 01:24 PM
Originally Posted by Zekester (Post 4935715)
1986 Donzi, Gen 5 502 recently rebuilt, 12 hours on it, roller cam...oil change prior to winter, builder specified never to run synthetic...

I thought of Lucas Hot rod oil 20W50, what say the masses?
The best COA, get a good coventional oil like VR1, and run it for 40-50 hrs, then get a sample on it. See how it's doing. Run it a bit more if gtg. Get a rythm down. Inspect oil filters.


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