Switched to Synthetic, Lost Performance?
04-16-2008, 03:36 PM
#1
Thread Starter
Join Date: Feb 2007
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Posts: 14
Switched to Synthetic, Lost Performance?
I just switched to synthetic (Mobil 1 10w30) a couple weeks ago. It's a 2003 GT Auto, K&N filter, stock otherwise. It has 74,000 miles on it and saw nothing but conventional oil up to this point. I've put about 400 miles on the car since the switch and recently noticed a weird type of hesitation when I get on it while rolling. When I step on it, it now down shifts twice instead of just once like it used to. Don't know of any other way to explain it. Could this have anything to to with the switch to synthetic or should I be looking elsewhere? Any help will be appreciated.
Roger
Roger
04-16-2008, 06:09 PM
#3
1st Gear Member
Join Date: Jul 2007
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Posts: 143
RE: Switched to Synthetic, Lost Performance?
ORIGINAL: Roger2003GT
I just switched to synthetic (Mobil 1 10w30) a couple weeks ago. It's a 2003 GT Auto, K&N filter, stock otherwise. It has 74,000 miles on it and saw nothing but conventional oil up to this point. I've put about 400 miles on the car since the switch and recently noticed a weird type of hesitation when I get on it while rolling. When I step on it, it now down shifts twice instead of just once like it used to. Don't know of any other way to explain it. Could this have anything to to with the switch to synthetic or should I be looking elsewhere? Any help will be appreciated.
Roger
I just switched to synthetic (Mobil 1 10w30) a couple weeks ago. It's a 2003 GT Auto, K&N filter, stock otherwise. It has 74,000 miles on it and saw nothing but conventional oil up to this point. I've put about 400 miles on the car since the switch and recently noticed a weird type of hesitation when I get on it while rolling. When I step on it, it now down shifts twice instead of just once like it used to. Don't know of any other way to explain it. Could this have anything to to with the switch to synthetic or should I be looking elsewhere? Any help will be appreciated.
Roger
04-16-2008, 06:23 PM
#4
1st Gear Member
Join Date: Feb 2008
Location:
Posts: 99
RE: Switched to Synthetic, Lost Performance?
You should use 5-20W like recommended. The downshifting should be determined by your computer....vehicle speed and rpms are calculated and the comp should put it in the right gear. Don't know exactly what you mean about shifting twice. In my 02 GT Auto it will downshift from Overdrive to first gear if I nail it at about 40mph.
04-16-2008, 07:51 PM
#5
3rd Gear Member
Join Date: Apr 2007
Location: MA
Posts: 901
RE: Switched to Synthetic, Lost Performance?
ORIGINAL: fyouceeku
Im sorry as this is funny but I would go to the nearest chinese resterant and get a fortune cookie your trouble shooting needs.
Or you could try this http://www.osric.com/8ball/
wth is up with 10w-30 anyway? They use 5-30.
ORIGINAL: Roger2003GT
I just switched to synthetic (Mobil 1 10w30) a couple weeks ago. It's a 2003 GT Auto, K&N filter, stock otherwise. It has 74,000 miles on it and saw nothing but conventional oil up to this point. I've put about 400 miles on the car since the switch and recently noticed a weird type of hesitation when I get on it while rolling. When I step on it, it now down shifts twice instead of just once like it used to. Don't know of any other way to explain it. Could this have anything to to with the switch to synthetic or should I be looking elsewhere? Any help will be appreciated.
Roger
I just switched to synthetic (Mobil 1 10w30) a couple weeks ago. It's a 2003 GT Auto, K&N filter, stock otherwise. It has 74,000 miles on it and saw nothing but conventional oil up to this point. I've put about 400 miles on the car since the switch and recently noticed a weird type of hesitation when I get on it while rolling. When I step on it, it now down shifts twice instead of just once like it used to. Don't know of any other way to explain it. Could this have anything to to with the switch to synthetic or should I be looking elsewhere? Any help will be appreciated.
Roger
Or you could try this http://www.osric.com/8ball/
wth is up with 10w-30 anyway? They use 5-30.
04-16-2008, 08:12 PM
#6
4th Gear Member
Join Date: Sep 2006
Location: Contentment
Posts: 1,033
RE: Switched to Synthetic, Lost Performance?
your tranny might be on the outs. Check your Tranny fluid as per the owner manual. You might have a band in your tranythat is going bad. My old mustang had that problem and i had to get the overdrive band fixed. That is my sugestion.
04-16-2008, 09:50 PM
#8
5th Gear Member
Join Date: Sep 2006
Location: CA
Posts: 4,039
RE: Switched to Synthetic, Lost Performance?
74k miles, have you ever had your had your transmission fluid flushed or the filter replaced? When was the last time you checked the transmission fluid level? FYI if you are experiencing a shifting problem, you should start by looking at the trans.
04-16-2008, 10:10 PM
#10
5th Gear Member
Join Date: Jun 2006
Location: NY
Posts: 2,307
RE: Switched to Synthetic, Lost Performance?
Ihad a friend that told his wife to check the oil & fill it if it was low. She called him @ work& said car was smoking really bad after she filled the oil. When he got home he pulled the dipstick&,oil came out, lol. Turns out she literlly filled to to top of the valve cover untill she couldnt get any more in,[sm=insomnia.gif] HAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHA. He took 10 quarts out!!!!!! LOL. She just looked @ him & said "you said to FILL it".