Hello! Been an oil lurker for a while and have spent some considerable hours trying to learn everything I can about different oils and the real scientific differences. I am mainly wanting to compare Pennzoil Platinum High Mileage, Mobil 1 High Mileage, and Valvoline Full Synthetic with "MaxLife". I am open to other oils like Quaker State Ultimate Durability but without any science behind it, I can't help but think of it as a cheaper Pennzoil. Not impressed with Castrol, Royal Purple, or Amsoil (especially for the premium price) based on what I have found.
So some backstory on the intended car, I have a 2003 Lexus GS300 that just turned over to 100k. It seeps/leaks a bit of oil just from just about everywhere but not very much of it. Not really enough to notice it on the dipstick and haven't needed to add more between changes. I got it from the dealership with a fresh Castrol synthetic blend and have performed two 5k changes with Pennzoil Platinum High Mileage. It seems to like this oil and runs very quietly. I would really like to get to 300k miles without having to tear the engine apart.
I understand that any fully synthetic oil will likely give the engine adequate protection but would like to give it the best case scenario without spending excess money. The three oils I have referenced can be picked up at Wally World in the $20-$30 range for a 5 quart jug which is awesome. So I am interested in metal protection but my main question is actually about the seal swell in these high mileage oils and how they differ. I have not been able to find much info on the high mileage versions of the three I have stated, or especially on how they differ in this regard. My leaking seems to only be from gaskets and not the seals so unsure if these will even help at all.
Based on the 540Rat Blog and http://pqiamerica.com/PCMO_Sample_Summary_12_15_2016.html they all seem to be well balanced oils, but again no real info on how the seal swells perform. I do not want to add a separate seal swell agent for multiple reasons. I may also hose down the engine and try Mobil 1 HM on the next few changes to see if I can spot a difference. Everything I have read about the Mobil 1 and the cold temperature tests seems very good but I did not have great luck in my last car with it. Again my leakage is very minimal but existent and I would love to find an oil that would minimize it further or stop it completely. Really don't want to spend a weekend tearing apart the engine just because it leaks a bit.
Any info from people who have tried these for multiple change intervals or can find real science on it would be greatly appreciated!
P.S. I found this really good channel on YouTube that I haven't seen posted on here before called Piotr Tester. In the last month he has begun doing some good wear testing on different oils (though sometimes different weights used). The high heat tests are interesting too and show Valvoline holding up really well. There are a lot of diesel oils and such but no Pennzoil Platinum as he is somewhere in Europe that is it not available (I believe I read Poland in the comments). May have to send him some myself if no one else does. Link: https://www.youtube.com/channel/UCLQb2UdBzX_lgTzaz4Ua1IA/videos
So some backstory on the intended car, I have a 2003 Lexus GS300 that just turned over to 100k. It seeps/leaks a bit of oil just from just about everywhere but not very much of it. Not really enough to notice it on the dipstick and haven't needed to add more between changes. I got it from the dealership with a fresh Castrol synthetic blend and have performed two 5k changes with Pennzoil Platinum High Mileage. It seems to like this oil and runs very quietly. I would really like to get to 300k miles without having to tear the engine apart.
I understand that any fully synthetic oil will likely give the engine adequate protection but would like to give it the best case scenario without spending excess money. The three oils I have referenced can be picked up at Wally World in the $20-$30 range for a 5 quart jug which is awesome. So I am interested in metal protection but my main question is actually about the seal swell in these high mileage oils and how they differ. I have not been able to find much info on the high mileage versions of the three I have stated, or especially on how they differ in this regard. My leaking seems to only be from gaskets and not the seals so unsure if these will even help at all.
Based on the 540Rat Blog and http://pqiamerica.com/PCMO_Sample_Summary_12_15_2016.html they all seem to be well balanced oils, but again no real info on how the seal swells perform. I do not want to add a separate seal swell agent for multiple reasons. I may also hose down the engine and try Mobil 1 HM on the next few changes to see if I can spot a difference. Everything I have read about the Mobil 1 and the cold temperature tests seems very good but I did not have great luck in my last car with it. Again my leakage is very minimal but existent and I would love to find an oil that would minimize it further or stop it completely. Really don't want to spend a weekend tearing apart the engine just because it leaks a bit.
Any info from people who have tried these for multiple change intervals or can find real science on it would be greatly appreciated!
P.S. I found this really good channel on YouTube that I haven't seen posted on here before called Piotr Tester. In the last month he has begun doing some good wear testing on different oils (though sometimes different weights used). The high heat tests are interesting too and show Valvoline holding up really well. There are a lot of diesel oils and such but no Pennzoil Platinum as he is somewhere in Europe that is it not available (I believe I read Poland in the comments). May have to send him some myself if no one else does. Link: https://www.youtube.com/channel/UCLQb2UdBzX_lgTzaz4Ua1IA/videos
