Schaefer Oil - 7000 or 9000

Cajthaml123 · Apr 2, 2008

I have searched and searched the archive files and could not find a clear answer about 5w 40 verses 15w 40. I live in Las Vegas and there are a couple of dealers here that sell the Schaefers oil and they keep pushing the 9000, however the owners manual says to use 15w 40 above 30 degrees. It is never cold here and most of the time it is 70 degrees or above. I will get to the question now is 5w 40 ok to use in high temperatures or should I stick to the 15w 40 as the manual says. Second question I have been told and read that you should not use synthetic in a deisel motor until 20,000 miles or more, is this true?

Thanks

jeffroski · Apr 2, 2008

If you look in bob is the oil guy forum you should find an answer about the weight of the oil. I live in AZ and use the 9000 because of the heat we see in summer. You can also look on Schaeffers web site as to the added benefits of the 9000. Just my opinion. Good Luck

LateArrivalforLSU · Apr 2, 2008

5W pumps better in cold weather. 5W-40 and 15W-40 are at the same viscosity at operating temp.

Go with a 5W-40.

Jim659 · Apr 2, 2008

I'd go with the 9000, it's a much better oil and very cheap insurance.

Cajthaml123 · Apr 3, 2008

No one has answered the second question. Break in of a diesel motor being different than a gas motor what is the correct milage number to switch to synthetic?

Thanks

Bammer · Apr 3, 2008

I changed over to synthetic at 1000 miles.... Opinions vary but I see no down side to switching to synthetic early on in it's life.

RichLube · Apr 3, 2008

Same here, changed at 1000 miles. Again, opinions vary.

Schaefer Oil - 7000 or 9000

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