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Will Switching to Mobil 1 Improve the Pressure in a Older Pickup?
 
Ask Your Stickiest Question. . . Or ask us something you’ve always wanted to know about using our products. We’ll sort through all the submissions and present the best questions to our automotive experts. We'll share the questions and their answers here.
Question:
Will Switching to Mobil 1 Improve the Pressure in a Older Pickup?
I bought a 1982 GMC S10 with 65,000 actual miles that had been sitting for 9 years. After using Mobil 1, the oil got very dirty very fast. I fear the original owner never changed the oil. (It still had the factory brakes and shocks.) After putting a regular good quality oil in and changing it and the filter several times, the pressure drops to about 5 PSI (cold pressure is about 40 PSI, idle). Letting it sit for a short time usually brings it back a little higher and it stays that way. Should I switch back to Mobil 1 and hope for the best?
-- Bill Weller, Roswell, NM
Answer:
We would certainly recommend giving Mobil 1 another try.  Mobil 1 is specially formulated with advanced cleaning additives to protect engine parts. It is entirely possible that Mobil 1 was doing what it was designed to do and began loosening some of the previous deposits from the engine. Especially if it had sat idle for nine years.
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