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Does anyone have any experience with or opinions about using high end 5w-40 diesel oils in marine engines? I'm mostly concerned with recreational boats. I had been thinking about starting a thread specifically about Delvac 1, but now that my favorite oil manufacturer (Schaeffer Mfg) has come out...

My boat has several non-skid surfaces on fiberglass. The best way I can describe it is, it looks like knurling. Since it's just part of the fiberglass, I want to protect/preserve it, but everything I know about will (does!) make the surface slippery. Kinda defeats the purpose of the non-skid and...

Although this is mainly addressed to Bob, can anyone tell me the difference between these two greases? And please don't just cite what's on the spec sheets, I can and have read them myself. Many of the specs are similar or identical. A few are quite different. Mostly I'm looking for a...

Previously I posted two analyses from this car using Schaeffer's 5w30. I had great results, but given the factory preffered viscosity of 5w40, and the summer temps I decided to try the 15w40. I've posted all three results below. The last analysis was done by a different lab than the first two...

Below are the results of three successive oil analyses, with three differents brands of oil. I now know that comparing the results isn't completely fair because the additive packages of different oils may compete or counteract each other. Still my naive evaluation tells me that Mobil 1 isn't all...

Here are the first two oil analyses for my 2002 VW Passat, with a 1.8L turbo. This is a zippy little engine, and while we definitely don't beat on it, both my wife and I like to stick our foot (feet?) into it when we can. The miles are almost exclusively highway miles. A Purolator Pure One was...