Reducing OCIs with Age
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Originally Posted By: Joe90_guy
I would say there's an argument for moving to a heavier, less volatile engine oil as your car ages.
As your bores and ring faces wear with age, the engine will need a thicker hydrodynamic film for the metal surfaces to ride on. The easiest way to do this is moving to a higher viscosity oil.
Also as the bores & rings wear, the engine will produce more blow-by which will directionally both dump more fuel into the oil and strip more of the light front-end out of the oil to be routed through the intake to be burnt. Moving to a thicker, but less volatile oil mitigates against this. A progression from 5W20 to 10W30 to 15W40 to 20W50 might make sense.
IMPORTANT DISCLAIMER
No American political figures (even the crazy ones likely to start WWIII) were harmed or otherwise ridiculed in the preparation of this post.
So you s start with the lightest grade oil(5w30 or 5w20) then about 75k, you start using High Mileage oils(same grade) Then 175k miles, you start going out of grade with a thicker oil(10W30 to 15W40 to 20W50 ) all this time you also increase longer OCI's
At that time you using 20w50, you should be at a million miles.
I would say there's an argument for moving to a heavier, less volatile engine oil as your car ages.
As your bores and ring faces wear with age, the engine will need a thicker hydrodynamic film for the metal surfaces to ride on. The easiest way to do this is moving to a higher viscosity oil.
Also as the bores & rings wear, the engine will produce more blow-by which will directionally both dump more fuel into the oil and strip more of the light front-end out of the oil to be routed through the intake to be burnt. Moving to a thicker, but less volatile oil mitigates against this. A progression from 5W20 to 10W30 to 15W40 to 20W50 might make sense.
IMPORTANT DISCLAIMER
No American political figures (even the crazy ones likely to start WWIII) were harmed or otherwise ridiculed in the preparation of this post.
So you s start with the lightest grade oil(5w30 or 5w20) then about 75k, you start using High Mileage oils(same grade) Then 175k miles, you start going out of grade with a thicker oil(10W30 to 15W40 to 20W50 ) all this time you also increase longer OCI's
At that time you using 20w50, you should be at a million miles.
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Originally Posted By: tig1
Since I started using Mobil 1 oils in the 70's, I change at 10K(miles). I have kept that OCI even with engines that had 350K. Has worked very well for me.
Same here, with a number of different synthetic brands and a number of different filters. Did it for over 20 years until I wrecked the Accord with 353K on it.
Since I started using Mobil 1 oils in the 70's, I change at 10K(miles). I have kept that OCI even with engines that had 350K. Has worked very well for me.
Same here, with a number of different synthetic brands and a number of different filters. Did it for over 20 years until I wrecked the Accord with 353K on it.
Only vehicle I took to high miles I sorta did that--in some ways I didn't care anymore. I had gotten what I wanted out of it. Plus all those who did used oil analysis indicated oil was capable of going much longer than thought.
I did have a Saturn which, due to oil usage, I did start to stretch the OCI. I wasn't on bitog at the time, so the notion of replenishing additive packages/etc wasn't on my mind. I'd probably do the same again, once it starts consuming oil, start extending the OCI.
I did have a Saturn which, due to oil usage, I did start to stretch the OCI. I wasn't on bitog at the time, so the notion of replenishing additive packages/etc wasn't on my mind. I'd probably do the same again, once it starts consuming oil, start extending the OCI.
While my Matrix was under warranty I stuck with the 6 month limit in the Service Schedule.
Mileage varied ~1300-4000 miles (I don't drive every day).
After warranty I now go 5000 miles, which has taken up to 11 months.
Mileage varied ~1300-4000 miles (I don't drive every day).
After warranty I now go 5000 miles, which has taken up to 11 months.
I found this quote about reducing intervals on a high mileage engines. The author believed it could be beneficial to shorten the OCI on some older engines:
As an engine accumulates miles, blowby increases. Combustion gases leak past the rings (blowby). This allows more unburned fuel and moisture to enter the crankcase. Fuel dilutes the oil, and moisture promotes the formation of acids and sludge. So if the oil is not changed often enough, you can end up with accelerated wear, oil sludging and possibly a premature engine failure
As an engine accumulates miles, blowby increases. Combustion gases leak past the rings (blowby). This allows more unburned fuel and moisture to enter the crankcase. Fuel dilutes the oil, and moisture promotes the formation of acids and sludge. So if the oil is not changed often enough, you can end up with accelerated wear, oil sludging and possibly a premature engine failure
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