I have an unopened 5 Qt. 10-30 full synthetic container I like to use in my daughter’s 4.2L it will likely need 6Qts but the only 1Qt bottles I have are 5-30 also fully synthetic. I’d like to use this combination on the next oil change due shortly and wondered if there is any input strongly against this one time mix. The engine is in super condition runs great, no leaks, and uses 0 oil between changes. I always used full synthetic oil and changed at computer suggested intervals. 120k miles.
Thanks in advance for input.
Thanks in advance for input.