Would 10w40 ease piston slap?
09-12-2011, 08:00 PM
#1
1st Gear Member
Thread Starter
Join Date: Sep 2011
Location: tx
Posts: 63
Would 10w40 ease piston slap?
my rattle was diagnosed today with piston slap, but not the nice kind that goes away when the motor warms up, it happens regardless of temperature between 2500-2800 rpm only! not at idle and not under load. If I drain the 5w20 and refill with 10w4 will it ease this, will it damage the motor in any way usng the thicker oi??
09-13-2011, 12:33 AM
#2
Join Date: Sep 2011
Posts: 14
by piston slap do you mean when the piston hits the valves??? if so then no oil will fix that. but depending on how long you are trying to make it last i would go with 20w50. my wifes passat 1.8 turbo had bad rod barings and to quite it until the next month i ran mobil one synthetic rear dif fluid thats like a 75w and it made it very quite.
09-13-2011, 08:32 AM
#5
TECH SAVANT
Join Date: Dec 2006
Location: Saint Augustine, FL
Posts: 10,938
Piston slap occurs when the piston skirt wears and the piston rocks back and forth about the wrist pin as it travels up and down--"slapping" the cylinder walls.
It is caused by far too infrequent oil changes; once the the anti-wear additives have completely broken down the piston skirt is one of the high load areas that takes the biggest hit.
Heavier oil may quiet it, also one of the "mechanic in a can" products like STP oil treatment. The good news is that it can occur for a long time before the engine dies--I had a 1973 Jeepster that slapped so badly you could hear coming from 1/2 mile away, drove it over 100k miles sounding like that.
It is caused by far too infrequent oil changes; once the the anti-wear additives have completely broken down the piston skirt is one of the high load areas that takes the biggest hit.
Heavier oil may quiet it, also one of the "mechanic in a can" products like STP oil treatment. The good news is that it can occur for a long time before the engine dies--I had a 1973 Jeepster that slapped so badly you could hear coming from 1/2 mile away, drove it over 100k miles sounding like that.
09-13-2011, 09:48 AM
#7
1st Gear Member
Thread Starter
Join Date: Sep 2011
Location: tx
Posts: 63
Piston slap occurs when the piston skirt wears and the piston rocks back and forth about the wrist pin as it travels up and down--"slapping" the cylinder walls.
It is caused by far too infrequent oil changes; once the the anti-wear additives have completely broken down the piston skirt is one of the high load areas that takes the biggest hit.
Heavier oil may quiet it, also one of the "mechanic in a can" products like STP oil treatment. The good news is that it can occur for a long time before the engine dies--I had a 1973 Jeepster that slapped so badly you could hear coming from 1/2 mile away, drove it over 100k miles sounding like that.
It is caused by far too infrequent oil changes; once the the anti-wear additives have completely broken down the piston skirt is one of the high load areas that takes the biggest hit.
Heavier oil may quiet it, also one of the "mechanic in a can" products like STP oil treatment. The good news is that it can occur for a long time before the engine dies--I had a 1973 Jeepster that slapped so badly you could hear coming from 1/2 mile away, drove it over 100k miles sounding like that.
09-13-2011, 10:33 AM
#9
TECH SAVANT
Join Date: Dec 2006
Location: Saint Augustine, FL
Posts: 10,938
Some have run as much as 7 however there is no need to...