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Old 10-09-2007, 04:40 AM   #1
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Default non synthetic to synthetic oil?

just changed the oil today at 1k miles. used subaru NONsynthetic oil. was wondering if it would be ok once i hit 3xxxx miles that i began using synthetic oil.
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Old 10-09-2007, 09:34 AM   #2
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Would be fine to switch to synthetic oils anytime.
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Old 10-09-2007, 10:48 AM   #3
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Chapter/Region: Tri-State
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04 FXT


But do not be lured into the misconception that your engine is completely broken in and you will have better protection. At 3,000 miles, your engine will still have high wear metals and that lowers the viscosity of the oil.

Using the proper viscosity for your conditions is probably the most important factor over "when to switch to synthetic".

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Old 10-11-2007, 12:17 AM   #4
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I would wait to 10,000 miles before you use sys oil. Engine got's to break in.
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Old 10-11-2007, 01:45 AM   #5
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2004 Impreza WRX
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From the Unabomber Oil FAQ:

If I want to use synthetic, when should I switch?
This is a hotly debated topic and you will find many convincing arguments for waiting a certain amount of miles or oil change cycles. There is no evidence that one particular time is best, so switch to synthetic when you feel is best, be it at 10,000 miles or 10 miles.

My car has XX,000 miles on it, can I switch over to synthetic?
Yes. Some recommend an engine oil flush prior to the synthetic conversion. An engine flush is usually a very thin oil designed to remove old oil deposits. There are many convincing arguments as to whether this step is required or not. Arguably the best engine flush treatment is Auto-RX.
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Old 10-11-2007, 02:44 AM   #6
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had my oil changed to Castrol Syntec from 1K. Haven't really burned or dropped the oil level since. Must have lucked out with a good engine.
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Old 10-12-2007, 02:58 PM   #7
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Location: Carson City, Michigan
2011 STI/2010 370Z
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I've run Syntec 5-30 since 2nd oil change. Haven't used a drop between changes. ( I keep a close eye on my oil/fluid levels). RP
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