Synthetic oil
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Senior User
Joined: Jul 2003
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From: New Mexico
Synthetic oil
I just bought my Bronco and it has a small oil leak. Two small quarter size drips in my garage after two weeks. The seller is running synthetic oil. I have heard that synthetic oil can cause leaks in an older engine because it seaps through where regular oil won't. Is this true? Is it OK to switch back to regular oil after running synthetic? I have heard that synthetic breaks regular oil down if it is mixed.
Cargo Master
Joined: Dec 2003
Posts: 2,735
Likes: 38
From: Sunny Florida
I have heard the same thing about the synthetic oils. I like Pennzoil. I can't explain the tech reasons but it was explained to me plus I have worked on and rebuilt my fathers engines and he as well uses pennzoil.
Senior User
Joined: Dec 2003
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two small quarter size drips in my garage after two weeks.
Posting Guru
Joined: Sep 2003
Posts: 2,259
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From: Florida Hill Country
Dino oils like Valvoline, Mobil, Exxon Uniflo will do just fine as long as service intervals are followed. There is a lot of threads about this sort of thing in the Oil & Lubrication Forum. https://www.ford-trucks.com/forums/f...?s=&forumid=70
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Cargo Master
Joined: Nov 2003
Posts: 2,000
Likes: 39
From: North Dakota
I have always had good luck with Vavoline high millage. Pennzoil has parrafene in it and if you ever dig into an engine that used pennzoil it is nothing but gum and gook. That just my opinion.
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Cargo Master
Joined: Dec 2003
Posts: 2,735
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From: Sunny Florida
My fathers engine had over 250K on it and not a bit of gum. His current engine that I rebuilt has over 300K on it and he hauls with it just about every day so it's not just driven as a daily driver it's used as a work truck.
Post Fiend
Joined: Jun 2001
Posts: 5,228
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From: Running Springs CA
The general consensus is that if it leaks at all, synthetic will leak worse, but modern synthetics wont "cause" leaks. The original Mobil One did cause leaks because the Poly Alpha Olefin base oil shrinks seals. Modern synthetics are either non-PAO or have seal conditioners.
Bottom line, you can switch back to conventional and it may solve your problem. Chevron/Havoline are my current favorites. Pennzoil is now owned by Shell and today is excellent, not the same as years ago.
Jim
Bottom line, you can switch back to conventional and it may solve your problem. Chevron/Havoline are my current favorites. Pennzoil is now owned by Shell and today is excellent, not the same as years ago.
Jim
Cargo Master
Joined: Dec 2003
Posts: 2,735
Likes: 38
From: Sunny Florida
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