Just passed 5k miles on my 4th and final oci of Valvoline R&P for a total of 20k miles. It’s been hard to keep my mouth shut but here are the details and results!!
2018 Subaru Outback that I bought new. Started burning oil right at about 60k miles. Before that it only used about a 1/4 quart in a 5k mile oci. It started using 1 quart in 5k miles and steadily increased to almost 3 quarts in 5k miles. I was adding a little over a quart every 2k miles when I started this test. I have done every service myself on this vehicle including the pcv valve on time. I’ve only used a couple high quality full synthetic oils at 5k mile oci’s since new. The internals have always been spotless. I used a borescope and found oil wash on 3 pistons confirming my suspicion of stuck low tension oil rings. Here are the oils I’ve used in detail.
500-35k miles M1 FS 0w40
35k-100k miles Valvoline EP 5w30
100k-110k Amsoil SS 5w30
110k-130k Valvoline R&P 5w30
Results with R&P:
1st oci=no change
2nd oci= no change(almost gave up)
3rd oci=added 1/2 qt at 2k miles, 1/2 qt at 4k miles! Used a little over a quart in 5k mile oci.
4th oci=added 1/2 quart at 3k miles and used a total of less than 3/4 quart in 5k mile oci.
So R&P has improved my oil consumption from almost 3 quarts per 5k miles to less than 3/4 quarts in 5k miles. Not 100% but not to shabby if you ask me. I highly recommend people give R&P a try for at least 4 oci’s.
My plan is to run M1 ESP 0w30 for the foreseeable future. I want to see if this oil will keep my piston rings as is. I will continue to update this thread with any changes.