1985 Toyota Corolla LE, 4A-LC engine
Mobil 1 Extended Performance M1-103 oil filter
5142 miles and 622 days on oil (yes, almost two years)
Mostly short trips (probably hard on oil)
Sampled through the dipstick using the Blackstone vacuum pump
Oil level was about 0.3 quart low, slightly more consumption than the previous 0.2 quarts
No makeup oil used
UOA by Wear Check
Oil used was TGMO 0W-20 SN ©2015. It turned out that it had no high moly and probably no GTL either!
The results are similar to those in the past, including for M1 0W-40, except for copper, which came almost twice as much this time. Lead was low. Aluminum was low. Chromium is still a tad bit high. Iron is normal. TAN and TBN are both good.
It's hard to say whether thick or thin is better. However, M1 had the best results on chromium. Perhaps I'll try a thick 15W-40 this time to see what it does.
I'm not sure if the premium, high-efficiency oil filter helped but lead was good.
I also don't know where the extra copper came from but perhaps there was some bearing wear.
It looks like the coolant seep has stopped.
Mobil 1 Extended Performance M1-103 oil filter
5142 miles and 622 days on oil (yes, almost two years)
Mostly short trips (probably hard on oil)
Sampled through the dipstick using the Blackstone vacuum pump
Oil level was about 0.3 quart low, slightly more consumption than the previous 0.2 quarts
No makeup oil used
UOA by Wear Check
Oil used was TGMO 0W-20 SN ©2015. It turned out that it had no high moly and probably no GTL either!
The results are similar to those in the past, including for M1 0W-40, except for copper, which came almost twice as much this time. Lead was low. Aluminum was low. Chromium is still a tad bit high. Iron is normal. TAN and TBN are both good.
It's hard to say whether thick or thin is better. However, M1 had the best results on chromium. Perhaps I'll try a thick 15W-40 this time to see what it does.
I'm not sure if the premium, high-efficiency oil filter helped but lead was good.
I also don't know where the extra copper came from but perhaps there was some bearing wear.
It looks like the coolant seep has stopped.