Hey,

I know this has been discussed many times in terms of what mark to fill your engine oil up to and the general consensus is to fill to the dipstick full mark, generally safe between low - full marker. Do not overfill.

My question is that if most people are filling close to the full mark at what point could you damage your motor when overfilling ? Like are we talking anything 1mm over the full marker could be catastrophic or is it safe up to 5mm over the full mark ? does this greatly vary with different strokers ? I'm using a full tomei 2.3 stroker kit/factory oil cooler and sump. I use 20/50 oil as it leaks less lol.

I ask as I have a locally built stroker motor thats been running for a while and it likes to chew and leak a little oil/has done for years (i think its mainly the sump that leaks more so than burning) So I regularly give it a slight top up and sometimes I'm not exactly accurate on what I put. (I know fix the leak right ? time poor..). Currently the oil reading is about 3mm over the full marker on dipstick (level ground, measured when warm after car has sat for ~45min. Measured with car off).

Should I be worried with it overfilled by 3mm (0.1 inch) ?

 

pic of car for attention!

 

From my experience I over fill mine when I going to track knowing it will burn some oil cause it generate a lot heat. About 2-3 mm should be fine

 

Hello

Here's what the manual says. No need to over think the level, just keep it between the marks at all times

 

I've run my oil a little above the max line mark on the dip stick sometimes and no issues. I do 1-2 autocross events a month and still running like a champ.

 

Didnt see a larger oil pan in your spec. Running a larger pan w/baffles should give you more protection from heat & oil starvation issues

Just a thought

 

totally agree and given that I have spun a bearing in the past an aftermarket pan is an item very high up on my shopping list. Sadly money is hard to come by in WA currently.

 

yup - for hpde's i would run full but probably not ideal for oil starve potentials - that said, i was always on street tires and not crazy fast.

i've since upgraded the pan to a ~6.5qt capacity, and comfortably run with the oil juuuust under max, at the lower angle of the max wedge of the dipstick

 

To really know you need the pan off and the dipstick inserted. What you want is the oil level below the rotating assembly.

 

Static oil level doesn't matter. You want dynamic oil level (engine running) to be below the rotating assembly. And even at that, you need to determine at what RPM you want the oil level to drop below the rotating assemble.

OP, run the engine at the full mark or a little over, you're not going to hurt anything. Autocross guys routinely run 1qt overfull to try to prevent oil starvation.

 

i always keep mine over filled... cause i pull some decent G's on my typical sunday drive.