So the old Ford Falcon 4.0 has clocked up 3000 miles in 2 years on Valvoline XLD 15w40. It gets driven rarely now, should I change now or leave it for another year? I've just added about 800ml to top it up and the oil does not look too dirty/black.
Old Ford OCI
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Change it. The oil has absorbed alot of sulfur in the combustion blow-by and the oil will likely have enough acidity to start breaking own gaskets and etching metal.
My rule of thumb is 2000 miles. Under 2000 miles and I leave the oil in,over 2000 and its gotta go.
But if its synthetic I'd leave it however oil is cheap.
My rule of thumb is 2000 miles. Under 2000 miles and I leave the oil in,over 2000 and its gotta go.
But if its synthetic I'd leave it however oil is cheap.
Keep it the time is not as important as operating time and miles.
Ken
Ken
Originally Posted By: Clevy
Change it. The oil has absorbed alot of sulfur in the combustion blow-by and the oil will likely have enough acidity to start breaking own gaskets and etching metal.
My rule of thumb is 2000 miles. Under 2000 miles and I leave the oil in,over 2000 and its gotta go.
But if its synthetic I'd leave it however oil is cheap.
Clevy.
I have reads lots of answers like yours both in the UK and here in the US. I have never seen any quantitative data to back it up.
As this is bitmog can you point to some UOA that shows a high TAN on two year old engine oils at these times or miles or for that matter short short trips.
eddie
Change it. The oil has absorbed alot of sulfur in the combustion blow-by and the oil will likely have enough acidity to start breaking own gaskets and etching metal.
My rule of thumb is 2000 miles. Under 2000 miles and I leave the oil in,over 2000 and its gotta go.
But if its synthetic I'd leave it however oil is cheap.
Clevy.
I have reads lots of answers like yours both in the UK and here in the US. I have never seen any quantitative data to back it up.
As this is bitmog can you point to some UOA that shows a high TAN on two year old engine oils at these times or miles or for that matter short short trips.
eddie
I always change any oil every year just to ensure that TBN is kept high. 3000 miles for sure.
Originally Posted By: Shannow
XLD, 5,000km, I'd change it...when XLD is on special again, not today.
I've still got a jug from the last time XLD was on a super special. I'll need to get a filter though, I hear SCA calling! I decided to pay the Rego again so it will last another year, then it really needs to be replaced! Cheers
XLD, 5,000km, I'd change it...when XLD is on special again, not today.
I've still got a jug from the last time XLD was on a super special. I'll need to get a filter though, I hear SCA calling! I decided to pay the Rego again so it will last another year, then it really needs to be replaced! Cheers
Speaking from experience, I change the oil in my off road vehicles every two+ years. UOA's indicate the oil condition to be fine and I could safely go to three+. I do not have these vehicles garaged either. They are in the elements all year.
I believe there was a guy on here years ago who tested his Toyota truck's multi-year oil and it was still plenty acceptable.
I believe there was a guy on here years ago who tested his Toyota truck's multi-year oil and it was still plenty acceptable.
what Clevy said above.
I change my old truck oil (1951 GMC with inline 6 engine) out at least 2 or 3 times a year, because of oxidation and other junk that is suspended in the oil; whether it has high miles or not.
Not a good idea to leave it resident in your engines working parts and sump over long periods of time.
GL
I change my old truck oil (1951 GMC with inline 6 engine) out at least 2 or 3 times a year, because of oxidation and other junk that is suspended in the oil; whether it has high miles or not.
Not a good idea to leave it resident in your engines working parts and sump over long periods of time.
GL
Originally Posted By: Shannow
Originally Posted By: Kuato
IMO take a sample for a UOA and leave it in until you get the results. Only way to be sure.
$40 for a UOA...oil is free (in shed), and $6 for a filter...
Sure, but I am always hearing how expensive motor oil is in Oz, so in this case maybe the cost of the UOA is worth it?
Originally Posted By: Kuato
IMO take a sample for a UOA and leave it in until you get the results. Only way to be sure.
$40 for a UOA...oil is free (in shed), and $6 for a filter...
Sure, but I am always hearing how expensive motor oil is in Oz, so in this case maybe the cost of the UOA is worth it?
Lemme get this straight... The UOA generally show all is fine even at two years, but most seem to recommend changing up to three times a year so they'll have that warm & fuzzy feeling???
At 3K mi and two years I'd change, though not likely before.... This is especially so if it's been run hard, as are my play toys...
At 3K mi and two years I'd change, though not likely before.... This is especially so if it's been run hard, as are my play toys...
Originally Posted By: EddieCairns
Originally Posted By: Clevy
Change it. The oil has absorbed alot of sulfur in the combustion blow-by and the oil will likely have enough acidity to start breaking own gaskets and etching metal.
My rule of thumb is 2000 miles. Under 2000 miles and I leave the oil in,over 2000 and its gotta go.
But if its synthetic I'd leave it however oil is cheap.
Clevy.
I have reads lots of answers like yours both in the UK and here in the US. I have never seen any quantitative data to back it up.
As this is bitmog can you point to some UOA that shows a high TAN on two year old engine oils at these times or miles or for that matter short short trips.
eddie
Find your own data. I've already answered your question.
Originally Posted By: Clevy
Change it. The oil has absorbed alot of sulfur in the combustion blow-by and the oil will likely have enough acidity to start breaking own gaskets and etching metal.
My rule of thumb is 2000 miles. Under 2000 miles and I leave the oil in,over 2000 and its gotta go.
But if its synthetic I'd leave it however oil is cheap.
Clevy.
I have reads lots of answers like yours both in the UK and here in the US. I have never seen any quantitative data to back it up.
As this is bitmog can you point to some UOA that shows a high TAN on two year old engine oils at these times or miles or for that matter short short trips.
eddie
Find your own data. I've already answered your question.
Originally Posted By: Kuato
IMO take a sample for a UOA and leave it in until you get the results. Only way to be sure.
Funny. Cost to change the oil and have clean oil will be roughly the same as a uoa.
Law of diminishing returns.
IMO take a sample for a UOA and leave it in until you get the results. Only way to be sure.
Funny. Cost to change the oil and have clean oil will be roughly the same as a uoa.
Law of diminishing returns.
oil is cheap. motors are expensive
Last edited:
Originally Posted By: Clevy
Originally Posted By: EddieCairns
Originally Posted By: Clevy
Change it. The oil has absorbed alot of sulfur in the combustion blow-by and the oil will likely have enough acidity to start breaking own gaskets and etching metal.
My rule of thumb is 2000 miles. Under 2000 miles and I leave the oil in,over 2000 and its gotta go.
But if its synthetic I'd leave it however oil is cheap.
Clevy.
I have reads lots of answers like yours both in the UK and here in the US. I have never seen any quantitative data to back it up.
As this is bitmog can you point to some UOA that shows a high TAN on two year old engine oils at these times or miles or for that matter short short trips.
eddie
Find your own data. I've already answered your question.
Clevy
I have checked the data and all the data I can find does not show any reasonable increase in acidity after a year.
Again I will ask, this is an oil discussion board where we are all learning from eaach other.
You have made a statement and I for one cannot find any data to confirm this.
I assume you have not made then answer up, therefore can you please advise if this is an opinion based on your gut feeling?
If not can you point to data that backs up your post as I would be interested to read it.
eddie
Originally Posted By: EddieCairns
Originally Posted By: Clevy
Change it. The oil has absorbed alot of sulfur in the combustion blow-by and the oil will likely have enough acidity to start breaking own gaskets and etching metal.
My rule of thumb is 2000 miles. Under 2000 miles and I leave the oil in,over 2000 and its gotta go.
But if its synthetic I'd leave it however oil is cheap.
Clevy.
I have reads lots of answers like yours both in the UK and here in the US. I have never seen any quantitative data to back it up.
As this is bitmog can you point to some UOA that shows a high TAN on two year old engine oils at these times or miles or for that matter short short trips.
eddie
Find your own data. I've already answered your question.
Clevy
I have checked the data and all the data I can find does not show any reasonable increase in acidity after a year.
Again I will ask, this is an oil discussion board where we are all learning from eaach other.
You have made a statement and I for one cannot find any data to confirm this.
I assume you have not made then answer up, therefore can you please advise if this is an opinion based on your gut feeling?
If not can you point to data that backs up your post as I would be interested to read it.
eddie
Eddie, while getting UOAs done is the only way to know for a specific vehicle, caution isn't a bad idea, particularly if the low miles are accumulated in short trips or if it's old enough to be carbureuted, particularly under bad weather conditions, or if the carb isn't in ideal shape or the engine is rather worn.
My old F-150 (before the rebuild) would be a good example. Fuel dilution was very high in that think, particularly in the winter, and even when my trips were very long. Fuel dilution was such that hot oil near the end of even a 3000 mile OCI would result in a low oil pressure light, which would not appear with fresh oil.
I can't give you a real data point on that, since a UOA would have been utterly useless. I wasn't going to be extending the OCI at all. I knew the lube was shot. And, I didn't need a lab tech to tell me that my oil was loaded with fuel.
Finding other people's data points for such scenarios will, I suspect, be similarly difficult. The people most likely to run UOAs are those running fleets or those looking to extend OCIs, not people who have vehicles that put on a thousand or two thousand miles a year.
My old F-150 (before the rebuild) would be a good example. Fuel dilution was very high in that think, particularly in the winter, and even when my trips were very long. Fuel dilution was such that hot oil near the end of even a 3000 mile OCI would result in a low oil pressure light, which would not appear with fresh oil.
I can't give you a real data point on that, since a UOA would have been utterly useless. I wasn't going to be extending the OCI at all. I knew the lube was shot. And, I didn't need a lab tech to tell me that my oil was loaded with fuel.
Finding other people's data points for such scenarios will, I suspect, be similarly difficult. The people most likely to run UOAs are those running fleets or those looking to extend OCIs, not people who have vehicles that put on a thousand or two thousand miles a year.
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