Annual Oil Change? That's BS isn't it?
05-09-2007, 12:09 PM
#1
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Annual Oil Change? That's BS isn't it?
When car companies (and oil companies) are advertising increasingly long mileage intervals between oil changes...and no mention is made of time intervals...why would anyone change the oil in their 928 annually if it's only driven a few thousand miles a year? It shouldn't deteriorate just sitting there. Annual oil changes under this circumstance doesn't make sense to me? Am I missing something?
Hx2
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05-09-2007, 12:27 PM
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My car is not driven in the winter months and its also not started.........Canadian weather. As such I change the oil and filter in the spring to rid it of any contaminants it may have from the 4-5 month hibernation.
I do the work myself, use synthetic oil and I buy filters in bulk from 1 of our preffered 928 suppliers.
Perhaps $90CDN once a year..........cheep ins. for the engine IMHO.
I do the work myself, use synthetic oil and I buy filters in bulk from 1 of our preffered 928 suppliers.
Perhaps $90CDN once a year..........cheep ins. for the engine IMHO.
05-09-2007, 12:28 PM
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Originally Posted by James-man
Are you talking synthetic oil or any run-of-the-refinery variey?
Harvey
05-09-2007, 12:30 PM
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Originally Posted by the flyin' scotsman
My car is not driven in the winter months and its also not started.........Canadian weather. As such I change the oil and filter in the spring to rid it of any contaminants it may have from the 4-5 month hibernation.
I do the work myself, use synthetic oil and I buy filters in bulk from 1 of our preffered 928 suppliers.
Perhaps $90CDN once a year..........cheep ins. for the engine IMHO.
I do the work myself, use synthetic oil and I buy filters in bulk from 1 of our preffered 928 suppliers.
Perhaps $90CDN once a year..........cheep ins. for the engine IMHO.
Harvey
05-09-2007, 01:08 PM
#6
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H2,
I've kind of wondered about this myself. As I recall (but could be wrong) from Doug Hillary's oil reports, he recommended changing annually, even though his UOA's showed the oil to still be within spec.
Glenn
I've kind of wondered about this myself. As I recall (but could be wrong) from Doug Hillary's oil reports, he recommended changing annually, even though his UOA's showed the oil to still be within spec.
Glenn
05-09-2007, 01:41 PM
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I was always under the impression that as oil is used its properties change. In a Dino oil supposedly if the oil sits for long periods it can become acidic. This assumes the oil has some mileage on it of course.
I'm not sure if the same applies for synthetics. Anyone know?
I'm not sure if the same applies for synthetics. Anyone know?
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05-09-2007, 01:45 PM
#8
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The less you drive your car, the more water ends up in the oil from condensation -- this combines with contaminants to create a corrosive mix. Changing once per year is cheap insurance.
05-09-2007, 02:47 PM
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Contaminants are by-products of combustion. Some of them are what make your oil appear "dirty" after some miles. These contaminants can create corrosion producing compounds, but they are there whether you drive or not. Since I too am up here in the Great White North, I drain my oil at the end of the season and leave the car sit with fresh oil. I'm not sure that this is a better method, but it feels good to me.
I think that the 1 yr oil change recommendation is consistent with the average annual milage expectation, which is about 10,000 miles
I think that the 1 yr oil change recommendation is consistent with the average annual milage expectation, which is about 10,000 miles
05-09-2007, 03:00 PM
#10
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Originally Posted by the flyin' scotsman
... I change the oil and filter in the spring to rid it of any contaminants it may have from the 4-5 month hibernation.
05-09-2007, 03:22 PM
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Point taken Martin but I should have mentioned I do late summer/fall change. the rational being the spring oil has had a hard summer from those who drive it as it should.
The point being to the original question, regardless of kilometers travelled the oil gets changed at least once if not twice a year and its garaged ~ Nov - Mar.
My tractors are a Universal 640, 4 cyl deisel, 4wd and a Sears 5000, V twin gas engine. Both are used all year, run on synthetic of correct viscosity and are changed once a year.
My truck, a 3/4 ton Chev, 6.6 Duramax diesel, 4wd farm truck, driven all year and oil/filter changed every 10k kms.
The point being to the original question, regardless of kilometers travelled the oil gets changed at least once if not twice a year and its garaged ~ Nov - Mar.
My tractors are a Universal 640, 4 cyl deisel, 4wd and a Sears 5000, V twin gas engine. Both are used all year, run on synthetic of correct viscosity and are changed once a year.
My truck, a 3/4 ton Chev, 6.6 Duramax diesel, 4wd farm truck, driven all year and oil/filter changed every 10k kms.
05-09-2007, 03:45 PM
#12
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You're OK- I shouldn't have jumped the gun... 
That's what I do and I think it's the way to go (although only the little JD garden tractor and a JD 935 diesel front deck mower get laid up for the "winter" here in VA).
That's what I do and I think it's the way to go (although only the little JD garden tractor and a JD 935 diesel front deck mower get laid up for the "winter" here in VA).
05-09-2007, 04:31 PM
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Originally Posted by H2
Why and how would oil sitting in your crankcase being unused and in a closed environment, get contaminants? I'm not against changing oil every year, it just doesn't make sense to me.
Harvey
Harvey