For a period (in the 90s?) GM had a sticker right in the glovebox prohibiting 10W-40 multiweights because of the potential risk of excessive engine deposits. I think the sticker may even have included an explanation similar to Nate's.
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This was a CYA to cover up a very poor engine design that was sludge-prone. AND the sludge could lead to premature engine failure. Also was some Toyota, VW, and some GM. Anyone who used a high detergency oil, and/or synthetic, e.g. "diesel" oil, could avoid the problem. Totally not relevant to our cars, unless you have a mid-90's engine in your ride. I have scraped a full inch of sludge off 60's engines that were still percolating fine, though very hot.quote:Originally posted by Dan Timberlake
For a period (in the 90s?) GM had a sticker right in the glovebox prohibiting 10W-40 multiweights because of the potential risk of excessive engine deposits. I think the sticker may even have included an explanation similar to Nate's.
Terry, North Texas
1963 Avanti R2, 63SR1065
(in stage 1 resto "Project A")
http://sterkel.org/avanti
1985 Kubota L2202(Diesel)
1999 Toyota rice burner
1986 Ford 150 Long Bed
New resolution.
I will continue to respond, to the best of my ability, to any query,
challenge or alternative view relevant to my original post.
I will not respond to anything off (the original) topic...Comment
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