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factory oil chart
At the risk of sounding stupid.....Why does this chart look like this? Why are some oils grouped together, while 10/30 and 10/40 are seperate at the bottom? I must be missing something.
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11-14-2005, 08:21 AM
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No responses?
I have no logical explanation other than the bottom line might be for synthetic oils. By design synthetic oils have a wider operation temperature range than mineral oils and this chart shows a very wide temperature range for the bottom bar. Where did the chart come from and what does the text associated with the chart say? I am assuming it is from a fairly modern owner's manual because 5W20s have only been out for a few years. The chart also indicates that 5W20 is only good to about 15F. What's up with that? Don
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72T Coupe - SOLD :-( |
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11-14-2005, 09:35 AM
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Notice that some bar graphs have sharp ( square) cut-offs...others have arrows ( > .. <) at the ends to indicate they "may" be OK in higher / lower temps, too.
Wil
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Wil Ferch 85 Carrera ( gone, but not forgotten ) |
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11-14-2005, 12:06 PM
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The graph is from Bentlys repair manual (love the book, best investment I have made). There is no explanation.
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11-14-2005, 12:33 PM
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Guys,
The illustration is directly from thr owner's manual and the lower bar is titled "Fuel efficient Oils" in my copy. They call it synthetic oil in the accompanying text. I am also quite sure that Porsche has recommended other multi viscosities since '87.
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Ned NYNA 11 87 Carrera targa 98 BMW 528i 98 Volvo V70 |
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11-14-2005, 12:45 PM
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1985 BMW 528e 2.7 Eta
1990 BMW 325is
1992 BMW 325ic
1997 BMW 318is
