Posted by TomA on December 22, 2011 at 09:32:15 from (76.9.65.34):
In Reply to: 30W versus 15W-40 oil posted by northvale on December 22, 2011 at 03:38:44:
Caterpillar called for 30W oil in the old ones that I have, Ford recommended 30W in the 6.9-7.3 IDI's. That is what I run in mine but the choice is easy because we never get temps below 30 here. When I got my '86' Dodge with the 318 I used 15-40 for a bit and noticed blowby so I run 30W in it too. Newer engines that call for multigrade I run 15-40.
I want to lubricate my engines with oil not polymers.
I was running Delo until they went to the LE oil. I switched to Rotella. Then I realized they are formulating these new oils for the new engines. Now I am using Supertech oil from Wal*Mart. I suspect this is the earlier formula that more closely matches the what older engines called for.
The 318 had a front seal leak for a long time, it has stopped now.
The biggest problem is the Supertech was $12 per 2 gallon, now it is up to $22.
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