Hello, I'm looking for your guys' thoughts on my situation before I go any further.
Changed over to synthetic with a couple additives (MMO and Orange Hyper-Lube and now I have a valve tick.
I drained the oil/filter in my newest project ('86 Jetta 1.8l 8v) shortly after the 28 mile trip home, as it was looking fairly dark on the dipstick. The following morning I pulled valve cover to see what I was dealing with, saw a significant amount of sludge, but all valves were within specified clearances. Next I installed an eco-guard filter and filled with 5w-30 Mobil1 High Mileage Full Synth, replacing 10% capcity with Marvel Mystery Oil and 10% capacity with Orange Hyper-Lube (thinking it would help counterbalance decrease viscosity). I did splash about 20% of this MMO over the valves. After oil change I started her up and everything sounded normal. Shut it off after 5-8 mins and then it sat for 8-9 days. This afternoon I started it up and instantly noticed a tick from under the valve cover. After 3 minutes of hopefully waiting for it to fade, I shut off the engine.
Two possible issues at hand: oil thinned out too much and/or too much sludge was dissolved- clogging the oil pump and galleys. The latter doesn't sound as likely as the oil/detergent only circulated for several minutes.
My gut tells me to replace with just 5w-30 but I'm looking for others' opinions.
Any and all input will be greatly appreciated
Thanks in advance.