B737-700 first officer reported unusual odor during takeoff roll which intensified during initial cl...

Narrative:

During our takeoff roll both the captain and I noticed an unusual smell. Shortly after we rotated the smell intensified quickly. At roughly 800 feet AGL the fas called the cockpit to report the same smell in the back of the aircraft. They stated it was intensifying quickly. Both the captain and I agreed the smell was of burning engine oil and we quickly donned the O2 masks. We stopped the climb and [requested priority handling] with ATC. The captain began running the smoke/fumes checklist; but we both agreed it was not proper for the event we were experiencing and we didn't have the time to complete the necessary steps and prepare for landing.we focused our attention on safely and quickly returning to the ground as we were concerned for the safety of our cabin crew and passengers. The captain quickly briefed our passengers that we were aware of the smell and were returning to the field. We ran our necessary checklists; retrieved our landing data and landed. We stopped on the runway and allowed crash fire rescue equipment (crash fire rescue) to inspect the aircraft for any noticeable issues outside the aircraft. They cleared us of any obvious external issues and we returned to the gate.we were informed that the aircraft had an engine wash the night before. Maybe doing a high power run prior to returning the aircraft to service; while operating the packs to verify the system is clear of any contaminates that may have been dislodged or blown into the bleed valves/system.

Original NASA ASRS Text

Title: B737-700 First Officer reported unusual odor during takeoff roll which intensified during initial climb. Flight executed a return to departure airport.

Narrative: During our takeoff roll both the Captain and I noticed an unusual smell. Shortly after we rotated the smell intensified quickly. At roughly 800 feet AGL the FAs called the cockpit to report the same smell in the back of the aircraft. They stated it was intensifying quickly. Both the Captain and I agreed the smell was of burning engine oil and we quickly donned the O2 masks. We stopped the climb and [requested priority handling] with ATC. The Captain began running the Smoke/Fumes Checklist; but we both agreed it was not proper for the event we were experiencing and we didn't have the time to complete the necessary steps and prepare for landing.We focused our attention on safely and quickly returning to the ground as we were concerned for the safety of our cabin crew and passengers. The Captain quickly briefed our passengers that we were aware of the smell and were returning to the field. We ran our necessary checklists; retrieved our landing data and landed. We stopped on the runway and allowed CFR (Crash Fire Rescue) to inspect the aircraft for any noticeable issues outside the aircraft. They cleared us of any obvious external issues and we returned to the gate.We were informed that the aircraft had an engine wash the night before. Maybe doing a high power run prior to returning the aircraft to service; while operating the packs to verify the system is clear of any contaminates that may have been dislodged or blown into the bleed valves/system.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Attributes
ACN	1660706
Time
Date	201906
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	B737-700
Operating Under FAR Part	Part 121
Flight Phase	Takeoff
Flight Plan	IFR
Person 1
Function	First Officer Pilot Flying
Qualification	Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 200
Events
Anomaly	Aircraft Equipment Problem Less Severe Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor

B737-700 first officer reported unusual odor during takeoff roll which intensified during initial climb. Flight executed a return to departure airport.