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Sniepster · 09-15-2021, 05:02 AM

So this summer my car started making a really strange knocking sound at start-up/cold start. It sounds like a knock however it only happens for half a second then goes away and the engine sounds absolutely normal. The sound is present ONLY if the car has been sitting for at least a day, so I am guessing it has something to do with the oil.

The car runs fine otherwise, no smoke coming out the exhaust and no other strange sounds coming from the engine.

Also there's no mods done to the engine other than a K&N air filter.

I ran the car during winter and it didn't make this sound, so i doubt it's due to temperatures.

The car has received regular oil changes at around 3500 miles. It has been running Motul 300V 5w40 for 40.000 miles.

Here's a link to how it sounds from inside the cabin:

09-15-2021, 05:02 AM	#1
Sniepster Member Join Date: Nov 2020 Drives: 2013 Toyota 86 Location: Bucharest, Romania Posts: 62 Thanks: 8 Thanked 17 Times in 13 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Cold start knock So this summer my car started making a really strange knocking sound at start-up/cold start. It sounds like a knock however it only happens for half a second then goes away and the engine sounds absolutely normal. The sound is present ONLY if the car has been sitting for at least a day, so I am guessing it has something to do with the oil. The car runs fine otherwise, no smoke coming out the exhaust and no other strange sounds coming from the engine. Also there's no mods done to the engine other than a K&N air filter. I ran the car during winter and it didn't make this sound, so i doubt it's due to temperatures. The car has received regular oil changes at around 3500 miles. It has been running Motul 300V 5w40 for 40.000 miles. Here's a link to how it sounds from inside the cabin: