Conventional to Syn back to Conventional

Maryland Stang said:

Synthetics don't ruin gaskets. They just flow easier especially when cold. They also often have better detergent packages and tend to clean things up and out when they're used. This leads to the rumor that synthetics cause leaks. They don't. They may just find one that wasn't leaking so much. You can switch back and forth as much as you like. My F-150 had about 110,000 miles on it when I tried Pennzoil Platinum. It did start using oil. About a quart every 1,500 miles. It wasn't using any before the switch. I switched it back to conventional Pennzoil 10w30 and it hasn't used any oil since.

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Darkwriter77 said:

+1

The people telling you that you can't switch from conventional to synthetic and back are probably the same folks that believe those Tornado things add 15 horses and that pouring NOS brand octane booster in your gas makes your car run a lot faster.

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