You can see I try keep my cars for the duration. I only use OEM Toyota/Lexus parts and fluids (even brake fluid and batteries). For the majority of their lives (so far) my oils have varied from Amsoil to Redline to Schaeffers etc. Good oils with 5-10K OCI's.
My 4Runner and my '98 LS 400 started leaking oil from valve cover and cam seals and finally has progressed to staining the driveway.
I started listening to AGCO Podcasts and they are staunch proponents of 3K OCI. Here is a copy and paste from their website:
The most common cause of failure with valve cover gaskets is a lack of maintenance. With extended oil changes, we may deplete engine oil additives that help keep valve cover gaskets pliable.
Without this protection, gaskets and seals get hard and may start to leak.
What is your opinion of this statement? Are we being duped by our owner's manual instructions and our focus on oil analysis?
My 4Runner and my '98 LS 400 started leaking oil from valve cover and cam seals and finally has progressed to staining the driveway.
I started listening to AGCO Podcasts and they are staunch proponents of 3K OCI. Here is a copy and paste from their website:
The most common cause of failure with valve cover gaskets is a lack of maintenance. With extended oil changes, we may deplete engine oil additives that help keep valve cover gaskets pliable.
Without this protection, gaskets and seals get hard and may start to leak.
What is your opinion of this statement? Are we being duped by our owner's manual instructions and our focus on oil analysis?