Compression tests. 4.2 S4 Section 2003-2009

New Tech notes Compression test motor or drive lin
#16

any time I see one of these on AZ I grab it and bring it here

Just got car back from dealership. Had compression and leakdown test done to gauge engine health due to visible smoke during engine braking. Car has 79000 miles still under CPO. Burns less than 1 quart of oil every 1000 miles. Here are the numbers, please let me know what you think:

Comp Leakdown
#1 170 7
#2 170 10
#3 165 10
#4 160 10
#5 145 10
#6 145 8
#7 145 25
#8 160 12

They said that during leakdown test #7 was shown to be leaking into the crankcase. Boroscope showed small scratches inside cylinder wall.
I asked the tech what the minimum wear values were, but he was of no help. I am concerned with the leakdown of 25% and wanted to know if anybody had some technical specs from Audi concerning these matters.

Thanks

#17

Year of the S4: 2005
Motor size: OEM 4.2
Mileage: example 120,000

Burns/leaks around a quart of oil between 5k miles oil changes. Two bottles of nitrous ran through so far. Runs good and checked just to get an idea.

  1. 145
  2. 155
  3. 145
  4. 150
  5. 145
  6. 145
  7. 155
  8. 155
#18

Here is some data given by a customer:

“Exhaust tips are black. Oil consumption has gone to like 1-2qt per 200-400 mi. Car still starts right up, without rattle, and drives.”

  1. 145
  2. 135
  3. 130
  4. 130
    5 .155
  5. 150
  6. 155
  7. 140
#19

Here is some data given by a customer:

“Exhaust tips are black. Oil consumption has gone to like 1-2qt per 200-400 mi. Car still starts right up, without rattle, and drives.”

  1. 145
  2. 135
  3. 130
  4. 130
    5 .155
  5. 150
  6. 155
  7. 140
#20

Year of the S4: 2008 B7 S4
Motor size: OEM 4.2
Mileage: 85,000 Mobil 1 0-40 every 5k

Comp Leakdown
#1 170 7
#2 170 10
#3 165 10
#4 160 10
#5 145 10
#6 145 8
#7 145 25
#8 160 12

The car was taking in 1 quart every 1k miles.

#21

Year of the S4: 2008 B7 S4
Motor size: OEM 4.2
Mileage: 85,000 Mobil 1 0-40 every 5k

Comp Leakdown
#1 170 7
#2 170 10
#3 165 10
#4 160 10
#5 145 10
#6 145 8
#7 145 25
#8 160 12

The car was taking in 1 quart every 1k miles.

#22

Year: B6, 2004 S4
Motor: OEM 4.2
Mileage: 123,600

Cyl 1: 132
Cyl 2: 148
Cyl 3: 140
Cyl 4: 150
Cyl 5: 142
Cyl 6: 142
Cyl 7: 151
Cyl 8: 148

Oil Change: Liqui Moly 5w40
Consumption: 1qt every 1200-1400 miles.

#23

Year: B6, 2004 S4
Motor: OEM 4.2
Mileage: 123,600

Cyl 1: 132
Cyl 2: 148
Cyl 3: 140
Cyl 4: 150
Cyl 5: 142
Cyl 6: 142
Cyl 7: 151
Cyl 8: 148

Oil Change: Liqui Moly 5w40
Consumption: 1qt every 1200-1400 miles.

#24

Going to have to check mine again, as my tech gave me the following figures - All taken when the engine was hot following a run after my timing chain overhaul.

Cyl 1: 195
Cyl 2: 200
Cyl 3: 200
Cyl 4: 200
Cyl 5: 180
Cyl 6: 180
Cyl 7: 200
Cyl 8: 200

#25

Going to have to check mine again, as my tech gave me the following figures - All taken when the engine was hot following a run after my timing chain overhaul.

Cyl 1: 195
Cyl 2: 200
Cyl 3: 200
Cyl 4: 200
Cyl 5: 180
Cyl 6: 180
Cyl 7: 200
Cyl 8: 200

#26

90k Miles
Castrol 5/40 Oil

Test carried out hot and wet (Fuel Supply Not Disabled)

#27

90k Miles
Castrol 5/40 Oil

Test carried out hot and wet (Fuel Supply Not Disabled)

#28

Year of the S4: 2005 B6 S4
Motor size: OEM 4.2 BHF
Mileage: 87,000
Oil Type/OCI: Mobil 1 0W-40 / 5,000mi
Consumption: ~half a quart every 5k

Compression: Leakdown%:
Cyl 1: 155 N/A
Cyl 2: 160 N/A
Cyl 3: 151 N/A
Cyl 4: 152 N/A
Cyl 5: 153 N/A
Cyl 6: 151 N/A
Cyl 7: 159 N/A
Cyl 8: 160 N/A

Year of the S4: 2005 B6 S4
Motor size: OEM 4.2 BHF
Mileage: 73,372
Oil Type/OCI: Castrol Syntec 5W-40 / N/A
Consumption: N/A

Compression: Leakdown%:
Cyl 1: 145 2
Cyl 2: 150 2
Cyl 3: 145 2
Cyl 4: 140 2
Cyl 5: 145 2
Cyl 6: 145 2
Cyl 7: 145 2
Cyl 8: 140 2

#29

Year of the S4: 2005 B6 S4
Motor size: OEM 4.2 BHF
Mileage: 87,000
Oil Type/OCI: Mobil 1 0W-40 / 5,000mi
Consumption: ~half a quart every 5k

Compression: Leakdown%:
Cyl 1: 155 N/A
Cyl 2: 160 N/A
Cyl 3: 151 N/A
Cyl 4: 152 N/A
Cyl 5: 153 N/A
Cyl 6: 151 N/A
Cyl 7: 159 N/A
Cyl 8: 160 N/A

Year of the S4: 2005 B6 S4
Motor size: OEM 4.2 BHF
Mileage: 73,372
Oil Type/OCI: Castrol Syntec 5W-40 / N/A
Consumption: N/A

Compression: Leakdown%:
Cyl 1: 145 2
Cyl 2: 150 2
Cyl 3: 145 2
Cyl 4: 140 2
Cyl 5: 145 2
Cyl 6: 145 2
Cyl 7: 145 2
Cyl 8: 140 2

#30

2005 B6 S4 Base
OEM 4.2L
Mileage: 163,000

Car was at temp
15 cranks per cylinder
Pulled the fuel pump fuse after car shut down

150 [4] ---- [8] 148
142 [3] ---- [7] 154
147 [2] ---- [6] 143
140 [1] ---- [5] 145

#31

2005 B6 S4 Base
OEM 4.2L
Mileage: 163,000

Car was at temp
15 cranks per cylinder
Pulled the fuel pump fuse after car shut down

150 [4] ---- [8] 148
142 [3] ---- [7] 154
147 [2] ---- [6] 143
140 [1] ---- [5] 145

#32

Compression test courtesy of b6dolphinS4!

Year: B7, 2006 S4
Motor: OEM 4.2
Mileage: 99,000

Cyl 1: 150
Cyl 2: 155
Cyl 3: 148
Cyl 4: 153
Cyl 5: 155
Cyl 6: 153
Cyl 7: 160
Cyl 8: 165

Oil Change: Liqui Moly 5w40

#33

Compression test courtesy of b6dolphinS4!

Year: B7, 2006 S4
Motor: OEM 4.2
Mileage: 99,000

Cyl 1: 150
Cyl 2: 155
Cyl 3: 148
Cyl 4: 153
Cyl 5: 155
Cyl 6: 153
Cyl 7: 160
Cyl 8: 165

Oil Change: Liqui Moly 5w40

#34

Year: 2004 S4
Motor: OEM 4.2
Mileage: 51300

1 = 127
2 = 138
3 = 129
4 = 129
5 = 109
6 = 111
7 = 125
8 = 122

Just purchased car, no idea on history. Today is not burning massive oil, 1qt per 3k miles. Normally does not have startup rattle.

#35

Year: 2004 S4
Motor: OEM 4.2
Mileage: 51300

1 = 127
2 = 138
3 = 129
4 = 129
5 = 109
6 = 111
7 = 125
8 = 122

Just purchased car, no idea on history. Today is not burning massive oil, 1qt per 3k miles. Normally does not have startup rattle.