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That was me.
I am pushing the concenus envelope on this, so you will not find a swell of support on this issue.
I am using a full synthetic 5W40. I happen to have Delvac 1 (5W40) on hand for our Passat TDI. So I use that. A gasser only 5W40 oil might have similar benefits.
So with better mpg's plus smoother and quieter, that sure sounds like better lubrication and less wear to me! And it has to be noted that a higher weight oil does not automatically mean that your mpg's will drop, dispite all of the 5W30 energy conservation oil hype that we get from detroit. I expect that the 5W30 oils might show some mpg benefits in a new tight engine.
So what is needed is for some folks to go out on a limb and try some W40 oils and report their findings. With the NG900 fleet aging, and running clearances increasing, perhaps a slightly thicker oil makes good sense from that perspective as well. Given the chain and sprocket failures on some of the engines, and extra margin of lubrication would seem to be a great objective too.
Delvac 1 is a 5W to allow for better lubrication in a cold diesel engine where the warm up cycles can be much longer than for a gasser. The W40 is because W30's often show higher wear rates on cam lobes and other marginal lub areas and these problems are mostly eliminated with W40's.
Delvac 1 is very hard to come by. It is $35CDN at some Canadian Wal-Marts, but is only availble in the US thru commercial channels. So a thicker main stream quality full syntheic oil would make more sense for most. I have not reviewed what is available in that regard.
The 5W40 in a synthetic will be a great all year around oil, so is a 5W30 syntheic. A nnWnn syntheic will always be a better winter oil than the same spec in a dyno oil.
So try a 5W40 or 10W40. You will know in one day if your engine seems quieter or smoother. A few days an you will have some mpg's to study.
Delvac claims that it will reduce fuel consumption. But compared to what. Most claims are made against a lessor dyno base oil. Syhnthetics are better lubricants however, and will help with mpg's. Assuming that piston rings are not stuck and that compression ratios are decent, these mpg gains should not be from better rings sealling as a result of a thicker oil.
A nnW40 will not cost more, try it.
Flat winds again this 70-77 F temperatures this AM, 32.5 mpg's on the expressway run, 70-75 mpg.
posted by 208.24.179...
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