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I have 2 quarts of Castrol Synthetic ATF. I was thinking of adding them to my tranny. I've been using Mobil1 ATF for the longest. I usually drain and fill my tranny fluid 1-2x a year, so at this point, it is likely all Mobil1 ATF. Would people not recommend mixing or would this be fine?

Is there any downside to using gas additives such as Regane or Lucas UCL while using ARX? I'm currently on my first rinse phase and would like to use Regane and UCL. I'm about to embark on a 700 mile trip. And want to use regane on the first tank full then UCL on the second and continue to use UCL.

This is an update on my first ARx treatment. http://theoildrop.server101.com/cgi/ultimatebb.cgi?ubb=get_topic;f=5;t=004525 Anyway, I just drained the oil from the first clean phase at almost 1600 miles, replaced filter and filled up with 10W-40 dino for the summer. The oil came out very dark...

Well, I just started my first AutoRx cleaning phase. Main reason is car has developed an annoying ticking noise. Most likely lifter noise and has started to burn some oil. Not much (about 1/2 quart every 4-5k miles), but its been solid for its entire service life so far. I just hit 100k and...

I'm looking for a heavier weight oil for my car (Lexus SC300) and came across this site. M1 is way too thin. Started using Royal Purple, now hearing about GC. I want to try 5W-40. How can you differentiate between green and gold? Can you just tell by looking at the bottle? Thanks.