Originally Posted By: Blkstanger
I had a small leak on my Ranger running Quaker State Ultimate Durability. I switched to Pennzoil High Mileage 10w30 and the leak stopped within 1,000 miles. Doesn't mark it's parking spot anymore.
I have had a nearly identical experience with Mobil Super High Mileage oil (5w20 in 5.4L v8 modular ford f350). This is a synthetic blend.
Slight weep and leaving a dime sized spot on my driveway overnight. Now It will leave a drop or two (cardboard) if left for 1.5 to two days or so without being driven. The weep is still there but it isn't dripping, I also haven't ever cleaned it other than wiping it at the last oil change (about 3,500 miles ago).
My prior consumption (on 5w20 Mobil 1 Full Synthetic and Pennzoil Conventional) was .75qt per 1,500 miles. Or about 1.5 qts at 3k.
Current High Mileage oil is in the engine for 3,500 miles, at which I added 1/2qt at around 800 miles when it was slightly low. It is still at the perfect full level after running it the current 3,500k. I check it every three days after sitting overnight in the same spot. I also check it when I get gas, the oil is surprisingly still golden brown.
For the winter I was looking at some Full Synthetic High Mileage oils, but over the service life of my vehicle it was fleet maintained. I am assuming with Conventional oil, and when using MOBIL 1 Full Synthetictehtic, it started the weep and the drips. The spots were about twice the size of what happened with Pennzoil conventional (which I used after Mobil 1). This has me planning on sticking with the High Mileage oils that are synthetic blends or full conventional flavor. I won't be wavering from the 5w20 weight, what with the cold winters here in NY and the small oil passages in the 5w20 spec'd 5.4l v8 modular.
I planned on running the same Mobil Super High Mileage oil over the winter. I have heard good things about this Pennzoil High Mileage oil which I might switch to also... Up in the air on a decision.
Does it make sense to do two or three changes with the same High Mileage oil, or is it OK to switch back and forth? Do you think the different additives will help/hurt each other?
I don't think that normally switching oils is dangerous, as many here do as well. Are High Mileage oils any different?
JC