Just when I think everything is fixed on my 89 RC, something else pops up. Doesn't seem to be a particularly reliable vehicle with only 105k miles... This time it's a rear main leak. I know I'll have to replace it eventually, but in the mean time I just want to slow it down. It leaks about a one inch puddle every time I stop. I'm running synthetic 10w30. Will thicker 40 weight oil with some rear main stop leak additive help out? Thanks.