While cleaning stuff in the basement, I found 6 liters of 20W50 oil lying around. They are unopened bottles of conventional Castrol GTX with a red cap which are probably about 15 years old since they were meant for a car I don't have anymore.
Instead of bringing them to the recycling center this way and therefore wasting them, I checked the manuals and the oldest car in my fleet could use it in hot temperatures.
For the time of the year that I use this car, I'm just under or at the very beginning of the 20w50 temp range.
I also have some Marvel Mystery Oil I normally use for my small engines. According to Marvel's FAQ, using 20% MMO in the crankcase lowers the oil rating by about 4 points, making it ~16W46.
I must also say that this car usually get 10W30 high mileage oil. It doesn't burn any that I ever noticed, but seeps a little in two spots. Would using this cocktail make it worse ?
What do you think of this plan ?
Should I just stick to straight 20W50 ?
20W50 with a high mileage additive ?
20W50 with both MMO and HM add ?
Not use it at all ?
Instead of bringing them to the recycling center this way and therefore wasting them, I checked the manuals and the oldest car in my fleet could use it in hot temperatures.
For the time of the year that I use this car, I'm just under or at the very beginning of the 20w50 temp range.
I also have some Marvel Mystery Oil I normally use for my small engines. According to Marvel's FAQ, using 20% MMO in the crankcase lowers the oil rating by about 4 points, making it ~16W46.
I must also say that this car usually get 10W30 high mileage oil. It doesn't burn any that I ever noticed, but seeps a little in two spots. Would using this cocktail make it worse ?
What do you think of this plan ?
Should I just stick to straight 20W50 ?
20W50 with a high mileage additive ?
20W50 with both MMO and HM add ?
Not use it at all ?