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All the synthetic brands say it's okay to top-off with conventional/natural oil. For example using Mobil 1 as your fill and a few thousand miles later topping-off with Pennzoil conventional. No prob. But they do not recommend topping-off with synthetics. For example, using Mobil 1 and later...

Originally Posted By: Fordiesel69 I want to do an experiment with gas mileage..... Why not just run RedLine's 5W-10 oil?

1987 Plymouth Caravelle 1997 Dodge (Mitsubishi engine) Avenger 5W-20 Amsoil Base 4 synthetic Currently using: Mobil Delvac 1 The manual says 5W-30 but I was wondering, since Amsoil is a strong synthetic oil, if I could use the 5W-20 in these older cars? (According to the specs, it's right on...

Originally Posted By: Mike_dup1 Heck, how long to do vehicles sit on dealer lots before someone buys it. I tried that argument and my mom said, "Don't you think they move those cars around? They are constantly rearranging their parking lots." Then yesterday my dad showed me Marilyn Vos Savant...

If I let my car sit for 3 or 4 months, is the oil going to turn to sludge? Will the seals rot? My parents keep saying, "You'll kill your car," but I think that's ridiculous. It's in a garage. It's protected from the elements. Your thoughts?