1997 legacy outback 2.5l dohc mt. I use 5w-30 conventional. So, I have an oil leak and no garage. Its January and I really dont feel like pulling the engine again when it's cold. I got a mild case of frostbite in my toes last time. Would it be alright if I switched to 10w-40 for a while until I'm able to pull the engine out comfortably again? The leak is on the back of the block. I used high-temp (red) rtv on the separator plate and wrist pin access and I know the plate is seeping. I cant get my borescope (compliments of wallyworlddotcom for $12) over to the bottom of the wristpin access to see. When I last had it out the wrist pin was leaking and I have collected random o rings while working in a b&s warehouse and had one that fit. And also used some of the high temp red rtv. Then, later I found out that particular o ring has some magical subaru properties and swells to fit the channel. Since then I've learned that I needed grey rtv (fujibond) which I actually had on hand at the time from when I did my head gaskets. Would going up an oil weight slow my oil loss??