Quote:
Originally Posted by t walgamuth
I tried rotella 15 40 in my 84 500 SEC. It was too thick and caused at least one of my automatic adjusters to collapse and stay collapsed making a noticeable ticking sound. I switched back to whatever the factory said to use and no more trouble.
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I seriously doubt if 15W-40 had anything to do with lifter collapse. I had one collapse on my erstwhile '84 190E 2.3 (replaced on warranty) that I sold to buy my '88 190E 2.6.
Most the viscosity range charts I've looked at from various manufacturers indicate that a 15W is okay down to 15-20F CONSISTANT cold starts and occasionally lower. If your cold starts are consistently below 15-20F use the "synthetic" 5W-40 CK-4. Of course it's more expensive than 15W-40 because it uses more "synthetic" base stocks that have a wider viscosity range.
Duke