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My car burns oil, should I add a thicker oil?

Tiny
YAZIDAN
  • MEMBER
  • 2004 TOYOTA COROLLA
  • 1.8L
  • 4 CYL
  • 2WD
  • MANUAL
  • 228,000 MILES
My car burns oil. Do you recommend putting thicker oil as for example 5W40 instead of 5W30. Thank you
Sunday, January 28th, 2024 AT 6:58 AM

7 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,924 POSTS
Using a thicker oil in a car that's burning oil is a commonly suggested remedy. Have you changed out the PCV valve because when the valve sticks open it can cause the engine to burn oil, here is the location so you can check it out. Check out the images (below). Please let us know what happens.
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Sunday, January 28th, 2024 AT 11:22 AM
Tiny
YAZIDAN
  • MEMBER
  • 91 POSTS
Yes. I changed the PCV valve from the dealer. No improvement.
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Sunday, January 28th, 2024 AT 3:06 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,924 POSTS
You might want to try a bottle of Lucas oil stabilizer and of course a thicker oil.
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Monday, January 29th, 2024 AT 10:08 AM
Tiny
YAZIDAN
  • MEMBER
  • 91 POSTS
So, can I put 5W40 instead of 5W30? However, 5w40 comes only synthetic. There is no synthetic blend. Is it okay to put synthetic? What do you recommend?
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Tuesday, January 30th, 2024 AT 8:35 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,924 POSTS
Synthetic oil tends to burn through engine a little more rapidly. I would try 10/40 racing engine oil. This oil tends to stay in engines longer.
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Tuesday, January 30th, 2024 AT 10:21 AM
Tiny
YAZIDAN
  • MEMBER
  • 91 POSTS
Sorry I forgot to ask. My car has a VVTI engine. Is it safe to use thicker oil on these engines?
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Sunday, February 4th, 2024 AT 6:56 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,924 POSTS
At 228,000 the engine tolerances are extended so it should be okay.
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Monday, February 5th, 2024 AT 10:33 AM

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