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Imported from Z31Performance.com Forums{{#if:jdmlegends| — original post by jdmlegends}}{{#if:2018-07-19 19:08:15|, posted 2018-07-19 19:08:15}}{{#if:4| · 4 post{{#ifeq:4|1||s}}}}{{#if:/Z31performance_archive/forum/z31-repairs-forums/engine-mechanical/540287-oil-leak-from-drain-plug-after-switching-to-full-synthetic.html|
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jdmlegends: (2018-07-19 19:08:15)

I usually use Valvoline 10w-30 synthetic blend, but bc I have a low mileage motor I decided to try full synthetic. I noticed that a slight amount of oil now leaks from the oil drain plug. Full synthetic has a higher flow rate than conventional oil so I know that it can leak by seals. However, I didn't expect it to leak past the drain plug and I'm pretty sure I didn't strip the bolt bc I inspected the bolt and it looks good. Has anyone else switched to full syn. and had the same problem? I am hoping that switching back to synthetic blend will prevent a leak bc I'd hate to have to replace the oil pan.

Z_Karma: (2018-07-19 19:13:22)

Is your crush washer/gasket still intact?

If not you can get a crush washer at any decent ACE hardware or NAPA.

I've ran Mobile 1 10W-30 in my cars with no leak issues at all.

jdmlegends: (2018-07-19 19:31:13)

This particular Z does not have an crush seal like some of the other cars I've had. I will check online or with NAPA.

jdmlegends: (2018-07-19 21:13:53)

Ordered a washer crush seal from the local Nissan dealer. Cost a whopping 18 cents plus a penny tax. I have found some very cheap prices there. Hopefully the seal will stop the leak.

Nissan Part No. 11128A if anyone else needs one.

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