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Synthetic oil interval?

 
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Old 07 Oct 2011, 11:04 am
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Default Synthetic oil interval?

I have on 04 N/A, with 50K on the odometer. My wife runs the hell out of the car. She probably averages 400 miles a week just in work mileage (90% highway), not counting incidental mileage. The car is on the way to the shop this afternoon for the oil pressure sending unit replaced, I have access to a lift, access to the part, but have to drive 90 miles round trip for the tool...

The question I have for you guys is, running a full synthetic oil, how far out can I push my oil change interval? I'm running Mobil1 Extended Performance 5W-30 (15K mile oil) and a Fram Xtended Guard (XG3614) filter (rated at 10K miles).

Can I expect to get 9K miles between changes if I'm maintaining my oil level? I seem to loose 1qt every 3000 miles. I'm going to try to replace the PCV valve and hose to see it that cures the oil burning.
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Old 07 Oct 2011, 11:24 am
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Default Re: Synthetic oil interval?

First, get rid of the FRAM filter. They use to be good years ago but were taken over and now if you see any of the tests done on filters, they come pretty low on the list.

Since your putting a quart in every 3,000. I'd say your good with the extended Mobil 1 for 9K. I go 5,000 on all the cars and my Sheriff's car uses a synthetic blend (part dino, part syn) and we go 7k between changes.
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Old 07 Oct 2011, 11:57 am
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Default Re: Synthetic oil interval?

A quart every 3000 miles is really not too bad. I was losing a lot more than that. But I changed my PVC valve and now I'm just losing what I consider to be a tolerable amount of oil (about one-half quart per 3000 miles). Apparently, the old PVC valve was allowing too much oil to pass into the manifold.

Tim
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Old 07 Oct 2011, 12:02 pm
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Default Re: Synthetic oil interval?

Quote:
Originally Posted by CREWZIN View Post
First, get rid of the FRAM filter. They use to be good years ago but were taken over and now if you see any of the tests done on filters, they come pretty low on the list.
Ill keep that in mind. FRAM is all I've ever used. Thanks!
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Old 07 Oct 2011, 12:07 pm
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Talking Re: Synthetic oil interval?

i use mobil one 5-30 and change out the oil at 6000 or so ,,sooner if my driving habits take a dive
get ride of the FRAM FILTER
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Old 07 Oct 2011, 05:01 pm
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Default Re: Synthetic oil interval?

Wix, Purolator are good filters - Mobil1, K&N even better.
As Crewzin noted, Fram has gone down from where it was.
There was a study where guy bought & cut open various filters - the material & design of bypass valve, type and amount of filter paper, etc, and Fram was cheap inside, the Wix & purolator good, the Mobil1 & K&N excellent. That's from my memory.
With highway miles, and using oil, I believe you're okay on interval.
I do 5,000 miles, because it's easy to tell by a glance at odometer when next change is due.
I'm at just under 100,000 miles and use no oil.
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Old 07 Oct 2011, 09:55 pm
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Default Re: Synthetic oil interval?

When using synthetic I just change it every 6 months regardless of the mileage (which would never be more than 7500 anyway)

On regular oil its every 5000 miles
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Old 07 Oct 2011, 10:45 pm
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Default Re: Synthetic oil interval?

That's weird...I've always used Fram filters and never had a problem...even on my Astro 95" with 225000 miles
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Old 08 Oct 2011, 11:23 am
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Default Re: Synthetic oil interval?




Pick your choice.
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Old 08 Oct 2011, 05:26 pm
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Default Re: Synthetic oil interval?

well i use Castrol Synthetic and a wix filter with a quart of Lucas oil stablizer everry month which is right at 4800
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