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> SOT: oil change interval, newer car with full synthetic
fixer34
post Sep 6 2024, 10:01 AM
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My wife's 2020 Mitsubishi SUV is coming up on 2 years since the last oil change. By the odometer, she has driven a little over 7000 miles. Car gets driven regularly, but short trips. Some 20-30 mins in length every couple weeks so we know the engine gets up to temperature. Oil is full synthetic.
Am I pushing the limits here (or over them), or get to the 2yr/8000 mile mark OK?

Just checked and the level is still over the Full line (they must have overfilled a bit..)
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technicalninja
post Sep 6 2024, 08:52 PM
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I have a strange friend...

Blake is a Fiero nut first of all.

Blake became an Amsoil dealer and wanted to "prove" Amsoil's claim of 15k intervals.

3 cars, a 87 Fiero 2.8l V6, a 12 Prius driven by his wife softly (many miles electric only), and a 07 Pontiac GXP 5.3l V8.

First set of Blackstone lab tests on Castrol GTX: 2500/5000/7500/10,000
All three cars came back "OK to continue use at 7500" and all three failed at 10K "Change oil".

Loss of the additive package was reason for failure.

Same cars, Amsoil, and 5K intervals as the test were getting expensive.

All three came back "OK to continue use" at 20K!!!

Didn't matter what type of vehicle. The old Fiero matched the new Prius on the tests.

Amsoil can go 15k like they advertise.

Amsoil sent Blake reems of "test data" regarding why to buy Amsoil when he became a dealer. Their testing methods and data was interesting to read.

Amsoil's testing showed the Amsoil was better than everyone else (go figure) but what it really showed was that ALL of the fully synthetic oils were in a different class than dino based oils.

Everyone's synthetic was VERY good!

Mobil 1 was usually 2nd or 3rd place but it's 2 to 3 times less expensive than the Amsoil products.

All in all, Blake's and Amsoil's testing made me into a Mobil1 believer!!!

I stock NO Amsoil engine oil and have nearly 50 gallons on Mobil1 on hand.

I'm guessing that is NOT what Amsoil had in mind...
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