996 C2 Rattle on Cold Start
04-19-2013, 03:35 PM
#18
I had a persistent start up rattle, both hot and cold, for just a fraction of a second. I changed the bottom chain tensioners and tried oils from 0-40 to 20-50 with no change.
Last oil change I went to Red Line 5-40 and the rattle is much better, probably 80% less. Its still there from time to time but much better. I guess our motors like pure ester (group 5) oils.
Last oil change I went to Red Line 5-40 and the rattle is much better, probably 80% less. Its still there from time to time but much better. I guess our motors like pure ester (group 5) oils.
As I noted earlier in this thread, I replaced my tensioners with new ones due to the rattling on a cold start up after my car wasn't driven for a week or more. It made no difference.
A couple of weeks ago I did an oil/filter change with Redline 20-50. I started it for the first time since the change this morning. No rattling. In fact the motor is very quiet with hardly any mechanical noise at all compared to before.
I was using Mobil1 5-40 before the Redline change.
I also sent an oil sample drawn from my oil filter housing to Blackstone for analysis. They said it looked great, but thought it was a 5-30 weight oil. I have heard the warnings about pulling the sample from the housing, but I would rather hear what the worst case scenario was, which there wasn't one.
04-19-2013, 06:01 PM
#19
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Your car may run hotter in stop and go traffic with that 20 weight oil. Keep an eye on the temp gauge. I can only use 0W40 in my '99 or the car turns into an inferno. I'm in Arizona where it's as hot as hell.
04-19-2013, 06:46 PM
#20
My car has never had any issues with running hot in the past, but I will keep my eye on it with summer around the corner.
09-11-2017, 06:54 PM
#21
Rennlist Member
I recently had a similar experience with redline oil.
As I noted earlier in this thread, I replaced my tensioners with new ones due to the rattling on a cold start up after my car wasn't driven for a week or more. It made no difference.
A couple of weeks ago I did an oil/filter change with Redline 20-50. I started it for the first time since the change this morning. No rattling. In fact the motor is very quiet with hardly any mechanical noise at all compared to before.
I was using Mobil1 5-40 before the Redline change.
I also sent an oil sample drawn from my oil filter housing to Blackstone for analysis. They said it looked great, but thought it was a 5-30 weight oil. I have heard the warnings about pulling the sample from the housing, but I would rather hear what the worst case scenario was, which there wasn't one.
As I noted earlier in this thread, I replaced my tensioners with new ones due to the rattling on a cold start up after my car wasn't driven for a week or more. It made no difference.
A couple of weeks ago I did an oil/filter change with Redline 20-50. I started it for the first time since the change this morning. No rattling. In fact the motor is very quiet with hardly any mechanical noise at all compared to before.
I was using Mobil1 5-40 before the Redline change.
I also sent an oil sample drawn from my oil filter housing to Blackstone for analysis. They said it looked great, but thought it was a 5-30 weight oil. I have heard the warnings about pulling the sample from the housing, but I would rather hear what the worst case scenario was, which there wasn't one.
09-26-2017, 09:38 PM
#22
Rennlist Member
From what I understand it comes from the exhaust lifters which leak down because they hang somewhat upside down.
