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#1
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Is it ok to switch back and forth between regular and synthetic motor oil?
I get this question a lot through PM's and at the shop. My experience is that it does not cuase any harm to the engine, but I also got some answers from the oil companies through their web sites:
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#2
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seal leaks
It's been posted on forums by members who claim they were told that if you switch from synthetic back to dino oils at a higher mileage you seals and or gaskets will shrink and leak. Any truth to this or just another urban legend?
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#3
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It could be possible to create leaks if you were to switch from conventional oil to synthetic on a higher mileage engine because the synthetics do a better job of cleaning.If they clean out sludge build up around a gasket or seal that wasn't leaking previously it could start a leak.
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Hybrid and GTR certified EV certified ASE Master Certified. |
#4
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#5
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pretty interesting i always wondered about the switching between oils.
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#6
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It's not like other forums where some attendees tend to be somewhat unfriendly or really have no valueable input to contribute.
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#7
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zhengwei,
Respectfully, you may want to open another topic for your question, as this topic is about something totally different. Thank you. |
#8
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absolutely
If your engine has sludge seals, meaning sludge has formed in the leaking seal synthetic is thinner and can leak through, and dissolve the seal. It says it everywhere including there. A high mileage engine synthetic can cause leakes in. Yes it has happened to me. ususally the engine is leaking some before and synthetic makes it leak more. |
#9
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So, what is considered high mileage. I have ~73K on my Frontier and have changed oil every 3000 miles. I have thought about switching to Mobile 1, but felt I let my mileage get too high.
Then, on the other side, I just bought a Murano. At what mileage should I wait to switch to Mobile 1? And why would somebody want to switch back and forth?
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#10
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So what is considered high mileage? i have 40000 on my Altima (08), is this to many miles?
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#11
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"Cint" - your question is perfectly answered by Mod mpe235. That is the only possible consequence if you did not have a decent regular oil change.
When I hit 90k a few months ago I switched to Castrol full synthetics. It's been almost 5k miles now. The oil still looks very good and I never had the need to add oil. Just a tad darker. I plan to initially change at 7.5k mi. With that I used FRAM high mileage oil filter. I think at 75k is considered high mileage. At least that's what I see in makers of motor oils, oil filters and other stuff. |
Tags |
back, motor, oil, regular, switch, synthetic |
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