What are ways and what can I check to see if a top end cleaner(specifically Subaru top engine cleaner) has damaged my engine? Is it even possible to damage a car if the job is done incorrectly? Could the dealer not put something back in place?
I took my car in for it's 30k service a few months ago. I was going to do my own oil change but long story short the 14mm bolt head stripped and i got fed up with dealing with it. Took it in to the dealer. They recommended 30k service which included a top end carbon build up cleaning, i had it done. Didn't realize subaru doesn't have it listed in the owners manual and that it was a dealer recommended service.
The second I drove off the lot the engine sputtered alittle when i pulled up to a redlight. It stayed running, but I could feel the engine shake as I slowed down. That was the only time it ever happened, it's been fine since. But idk if it's the cold weather recently(40 degreees F)...but my MPGs have suffered greatly since. I don't EVER remember having to fill up this often. Did some manual calculations today, 14.9 gallons(~18 gal tank) for 316 miles, 22 MPG. The last time I saw 22mpg was when I was driving down the highway at 80-85mph with a roof basket, set of factory wheels and 15 degree F temps. My last road trip 2 weeks ago I saw 27 MPG on the the cars read out(45 degree temp, no roof basket or anything). Prior to the 30k service I was seeing anywhere from 30-33 MPG highway, granted that was also during the summer.
The only thing I've done to the car was run an axle back delete from 22k-30k, then i got sick of the drone and put the factory muffler back on. The CVT does seem to hold RPMs around 3k now when cold...could that be the cause? If there anything I can do to up the MPGs again?
Current oil fill is with subaru 0w20 synthetic. Atleast that's what the SA told me. Would it be worthy to drain and fill with M1 AFE 0W20?
I took my car in for it's 30k service a few months ago. I was going to do my own oil change but long story short the 14mm bolt head stripped and i got fed up with dealing with it. Took it in to the dealer. They recommended 30k service which included a top end carbon build up cleaning, i had it done. Didn't realize subaru doesn't have it listed in the owners manual and that it was a dealer recommended service.
The second I drove off the lot the engine sputtered alittle when i pulled up to a redlight. It stayed running, but I could feel the engine shake as I slowed down. That was the only time it ever happened, it's been fine since. But idk if it's the cold weather recently(40 degreees F)...but my MPGs have suffered greatly since. I don't EVER remember having to fill up this often. Did some manual calculations today, 14.9 gallons(~18 gal tank) for 316 miles, 22 MPG. The last time I saw 22mpg was when I was driving down the highway at 80-85mph with a roof basket, set of factory wheels and 15 degree F temps. My last road trip 2 weeks ago I saw 27 MPG on the the cars read out(45 degree temp, no roof basket or anything). Prior to the 30k service I was seeing anywhere from 30-33 MPG highway, granted that was also during the summer.
The only thing I've done to the car was run an axle back delete from 22k-30k, then i got sick of the drone and put the factory muffler back on. The CVT does seem to hold RPMs around 3k now when cold...could that be the cause? If there anything I can do to up the MPGs again?
Current oil fill is with subaru 0w20 synthetic. Atleast that's what the SA told me. Would it be worthy to drain and fill with M1 AFE 0W20?
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