Quote:
Originally Posted by 1100s nut
Thanks TM. I just bought as 2013gs cam-head so I want to do the right thing and also cover my butt. The owners manual is more complex than it needs to be. I think 20-conventional oil will be fine for break in. I would probably worry more if they called for a 10w60 like in the M cars.
Lane
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My opinion is that they're less concerned with the protection at operating temperature and more concerned with engine wear during initial startup and warmup, the main reason for the 10W oil. For this reason, the use of the heavier weight oil for break in purposes appears to defeat the manufacturers purpose. Will you really get better startup/warmup oil protection from the 20W during break-in? I'm not sure that reasoning is valid. They also carefully chose oil that is a minimum 10W-40 weight. As it happens, oil lighter than 10W-40 is gradually having the zinc/phosphorus antiwear additives drastically cut back for various reasons, mostly environmental, while 10W-40 and heavier oils retains the high anti-wear additive levels. This is a general observation and may vary but I have a couple more oil analyses to show this trend that I've done for my own reasons. Flat tappet owners be aware.
But, we have a good opportunity here. If you use the 20W, and we can get someone else with the same engine to use the 10W then change the oil at the same break-in interval, take samples and have both tested, we can have some top notch data to use later. Break in oil samples usually have higher levels of metals from the break in process. The difference will give us the whole story. Blackstone Labs- $25/sample.