01-31-2007, 12:38 AM
Full Access Members
Join Date: Apr 2006
Location: College Station, TX
I noticed that when I used the Mobil 1 5w30 high-mileage I had a cold startup tick periodically. The regular 5w30 doesn't do it. I have a feeling that the viscosity on the high mileage formula is a thicker when cold so it can resist fuel dilution when it gets up to its 15,000 mileage. The modular motors have hydraulic lash adjusters that are similar to design to a lifter. One side of the cam follower which equates to rocker arm (closest explanation) rests on the the lash adjuster, the other on the valve. The cam presses on a roller that is basically in the middle of the follower.
The lash adjusters can have the same issues that plague a lifter on a pushrod motor......
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