Originally Posted By: 97tbird
This morning it went down to like 20F here, and both our cars are parked outside - promptly results in pretty noticeable start up clatter for some time, then smooths out...
Tbird 4.6L has MC 5w30 with MC filter
Elantra has Castrol (probably) 5w30 with oem filter
We both let cars warm up for a few min before driving, and then drive gently for the 1st few min's too...
So the amount of start up clatter is very probably harmless and normal - BUT it would be nice to minimize it...
so, in respect to oil (Or Gas?) additives, is there anything one can do?
[I am thinking of adding a bit of MMO to the bird's oil(kinda scared to do it on the Elantra as it has a much smaller sump) and gas and perhaps a bit in Elantra's gas (only)...
I was wondering what others are doing against start up clatter...
20* F shouldn't be a problem for a well maintained engine, however I do beg to differ when it dips well below 0. I've told this story a few times in posts but it is worth repeating. I have a cousin who lives up in the Adirondack north country, and it can go to minus 30*F at times. I had spent a long weekend with him a few years back and it had gotten to -25F during the night. My van had sat IIRC 3 days with Mobil 1 5W30 in the sump, and I thought this van was going to give birth when it finally started up. The noises were not good to hear. His Toyota at least 15 years newer with the same M1 fill sounded no better.
On another trip under similar weather conditions with the addition of 1 qt of MMO, the start was much easier and not as hard on the ears. His Toyota had the usual M1 fill no MMO. It was very easy to tell the difference. He became a MMO believer.
Try it, for less than $5 for a qt you might become a MMO user too. Even if only for the winter OCI. JMO